Begin middleware revamp

[ahopkins]

#2521 is a bit too ambitious, and really is a bit of scope creep. This PR is meant to obtain the benefits of middleware streamlining and up front assignment without adding the complexity of a new request handling mechanism.

---

This PR aims to:

• introduce an API to control middleware ordering
• performance boost

@app.on_request(priority=99)
async def high_priority(request):
    ...

[codecov]

Codecov Report

Base: 88.430% // Head: 88.479% // Increases project coverage by +0.048% 🎉

Coverage data is based on head (2c41fc5) compared to base (43ba381).
Patch coverage: 94.736% of modified lines in pull request are covered.

Additional details and impacted files

@@              Coverage Diff              @@
##              main     #2550       +/-   ##
=============================================
+ Coverage   88.430%   88.479%   +0.048%     
=============================================
  Files           78        79        +1     
  Lines         6474      6536       +62     
  Branches      1246      1251        +5     
=============================================
+ Hits          5725      5783       +58     
- Misses         517       521        +4     
  Partials       232       232               

Impacted Files	Coverage Δ
sanic/http/http1.py	84.827% <75.000%> (-0.384%)	⬇️
sanic/request.py	94.458% <77.777%> (-0.427%)	⬇️
sanic/middleware.py	96.774% <96.774%> (ø)
sanic/app.py	88.224% <100.000%> (+0.020%)	⬆️
sanic/asgi.py	90.163% <100.000%> (+0.247%)	⬆️
sanic/mixins/middleware.py	100.000% <100.000%> (ø)
sanic/worker/inspector.py	98.850% <100.000%> (+0.013%)	⬆️

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