Add support for partial decode / multithreading mode choice

[csvance]

• gRPC proxies need to be able to do partial decoding on raw inputs and pass along the raw buffer as the output. This matters especially with large protobufs which are seen with KServe protocol.
• Add choice for the user between sticky and non sticky tasks. sticky has better throughput / IO performance, but prevents proper multithreading. Fixes Sticky Test Failing on Nightly #114

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 86.36364% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.59%. Comparing base (a99aa4a) to head (4cb8949).

Files with missing lines	Patch %	Lines
src/gRPC.jl	71.42%	2 Missing ⚠️
src/Utils.jl	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #112      +/-   ##
==========================================
- Coverage   90.96%   90.59%   -0.38%     
==========================================
  Files           7        7              
  Lines         531      542      +11     
==========================================
+ Hits          483      491       +8     
- Misses         48       51       +3     

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