[WIP] Inline the endpoint search process

[Firehed]

Rather than instantiating a new class on every request, this inlines the endpoint search into the dispatcher. Currently it's basically a copy-paste of the classmapper's logic.

There are two high-level goals for this:

1. Reduce dispatching overhead
2. Increase format flexibility of the endpoint map, to allow future optimizations to matching

This is tangentially related to #51 and #98.

Before landing:

• Apply same logic to parser search
• Add more test coverage

[codecov]

Codecov Report

Merging #104 into master will decrease coverage by 0.47%.
The diff coverage is 91.66%.

@@             Coverage Diff              @@
##             master     #104      +/-   ##
============================================
- Coverage      96.5%   96.03%   -0.48%     
- Complexity      125      135      +10     
============================================
  Files            22       22              
  Lines           458      479      +21     
============================================
+ Hits            442      460      +18     
- Misses           16       19       +3

Impacted Files	Coverage Δ	Complexity Δ
src/Dispatcher.php	95.95% <91.66%> (-2.76%)	34 <10> (+10)

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