perf: reuse allocations where possible for refactor/remove-bytes

[Vonr]

vs refactor/remove-bytes:

Gungraun

gungraun::read_group::read complex_player:(read_file("tests/data/complex_player.dat"))
  ======= CALLGRIND ====================================================================
  Instructions:                      156945|158441               (-0.94420%) [-1.00953x]
  L1 Hits:                           215760|218863               (-1.41778%) [-1.01438x]
  LL Hits:                              426|427                  (-0.23419%) [-1.00235x]
  RAM Hits:                              85|85                   (No change)
  Total read+write:                  216271|219375               (-1.41493%) [-1.01435x]
  Estimated Cycles:                  220865|223973               (-1.38767%) [-1.01407x]
  ======= DHAT =========================================================================
  Total bytes:                        23658|23658                (No change)
  Total blocks:                         317|317                  (No change)
  At t-gmax bytes:                        0|0                    (No change)
  At t-gmax blocks:                       0|0                    (No change)
  At t-end bytes:                         0|0                    (No change)
  At t-end blocks:                        0|0                    (No change)
  Reads bytes:                        20845|20845                (No change)
  Writes bytes:                       19906|19906                (No change)
gungraun::read_group::read chunk:(read_file("tests/data/chunk.nbt"))
  ======= CALLGRIND ====================================================================
  Instructions:                      374038|366697               (+2.00193%) [+1.02002x]
  L1 Hits:                           512745|495402               (+3.50079%) [+1.03501x]
  LL Hits:                             2020|2025                 (-0.24691%) [-1.00248x]
  RAM Hits:                             463|466                  (-0.64378%) [-1.00648x]
  Total read+write:                  515228|497893               (+3.48167%) [+1.03482x]
  Estimated Cycles:                  539050|521837               (+3.29854%) [+1.03299x]
  ======= DHAT =========================================================================
  Total bytes:                        62716|62716                (No change)
  Total blocks:                         334|334                  (No change)
  At t-gmax bytes:                    62044|62044                (No change)
  At t-gmax blocks:                     332|332                  (No change)
  At t-end bytes:                         0|0                    (No change)
  At t-end blocks:                        0|0                    (No change)
  Reads bytes:                        12653|12653                (No change)
  Writes bytes:                       53924|53924                (No change)
gungraun::write_group::write complex_player:(read_file_to_nbt("tests/data/complex_player.dat")...
  ======= CALLGRIND ====================================================================
  Instructions:                      118093|355072               (-66.7411%) [-3.00672x]
  L1 Hits:                           171433|501785               (-65.8354%) [-2.92700x]
  LL Hits:                              355|1034                 (-65.6673%) [-2.91268x]
  RAM Hits:                              52|128                  (-59.3750%) [-2.46154x]
  Total read+write:                  171840|502947               (-65.8334%) [-2.92683x]
  Estimated Cycles:                  175028|511435               (-65.7771%) [-2.92202x]
  ======= DHAT =========================================================================
  Total bytes:                         3380|40613                (-91.6775%) [-12.0157x]
  Total blocks:                           1|946                  (-99.8943%) [-946.000x]
  At t-gmax bytes:                        0|0                    (No change)
  At t-gmax blocks:                       0|0                    (No change)
  At t-end bytes:                         0|0                    (No change)
  At t-end blocks:                        0|0                    (No change)
  Reads bytes:                            0|31864                (-100.000%) [---inf---]
  Writes bytes:                        3936|33722                (-88.3281%) [-8.56758x]
gungraun::write_group::write chunk:(read_file_to_nbt("tests/data/chunk.nbt"))
  ======= CALLGRIND ====================================================================
  Instructions:                      315736|1111765              (-71.6005%) [-3.52119x]
  L1 Hits:                           452053|1693890              (-73.3127%) [-3.74710x]
  LL Hits:                             3748|5901                 (-36.4853%) [-1.57444x]
  RAM Hits:                              56|1472                 (-96.1957%) [-26.2857x]
  Total read+write:                  455857|1701263              (-73.2048%) [-3.73201x]
  Estimated Cycles:                  472753|1774915              (-73.3648%) [-3.75442x]
  ======= DHAT =========================================================================
  Total bytes:                        44331|645941               (-93.1370%) [-14.5709x]
  Total blocks:                           1|1160                 (-99.9138%) [-1160.00x]
  At t-gmax bytes:                    44331|132563               (-66.5585%) [-2.99030x]
  At t-gmax blocks:                       1|2                    (-50.0000%) [-2.00000x]
  At t-end bytes:                         0|0                    (No change)
  At t-end blocks:                        0|0                    (No change)
  Reads bytes:                            0|485284               (-100.000%) [---inf---]
  Writes bytes:                       45499|528255               (-91.3869%) [-11.6103x]

Criterion

read/complex_player     time:   [10.538 µs 10.676 µs 10.793 µs]
                      thrpt:  [298.65 MiB/s 301.93 MiB/s 305.87 MiB/s]
               change:
                      time:   [-3.3676% -0.5746% +2.4782%] (p = 0.71 > 0.05)
                      thrpt:  [-2.4183% +0.5779% +3.4850%]
                      No change in performance detected.

read/chunk              time:   [33.164 µs 33.667 µs 34.099 µs]
                      thrpt:  [1.2108 GiB/s 1.2263 GiB/s 1.2449 GiB/s]
               change:
                      time:   [-7.9041% -4.1813% -0.4430%] (p = 0.03 < 0.05)
                      thrpt:  [+0.4450% +4.3638% +8.5824%]
                      Change within noise threshold.

   Running benches/write.rs (target/release/deps/write-15fb80df67147bb8)
write/complex_player    time:   [2.5407 µs 2.5644 µs 2.5854 µs]
                      thrpt:  [1.2175 GiB/s 1.2275 GiB/s 1.2390 GiB/s]
               change:
                      time:   [-83.944% -83.708% -83.469%] (p = 0.00 < 0.05)
                      thrpt:  [+504.92% +513.79% +522.83%]
                      Performance has improved.
Found 18 outliers among 100 measurements (18.00%)
18 (18.00%) low mild

write/chunk             time:   [10.866 µs 10.945 µs 11.025 µs]
                      thrpt:  [3.7447 GiB/s 3.7721 GiB/s 3.7997 GiB/s]
               change:
                      time:   [-80.070% -79.321% -78.612%] (p = 0.00 < 0.05)
                      thrpt:  [+367.55% +383.58% +401.77%]
                      Performance has improved.
Found 8 outliers among 100 measurements (8.00%)
8 (8.00%) low mild