Stricter charset handling and escaping of request URLs

[Tronic]

• HTTP1 and HTTP3 built-in servers now enforce ASCII (%-quotes should be used for UTF-8).
• ASGI uses raw_path to avoid quote/encode cycle and unquoting of %2F into / early on.
• ASGI no longer prepends root_path to path used in Sanic.
• Using backslash escapes in logging and BadURL messages to print invalid characters.

[Tronic]

Note: earlier discussion in #1837 (comment)

[ahopkins]

Can we add some tests to catch regressions?

[codecov]

Codecov Report

Patch coverage: 84.615% and project coverage change: -0.078 ⚠️

Comparison is base (1a63b9b) 88.912% compared to head (ef769d3) 88.835%.

❗ Current head ef769d3 differs from pull request most recent head 1520bf0. Consider uploading reports for the commit 1520bf0 to get more accurate results

Additional details and impacted files

@@              Coverage Diff              @@
##              main     #2710       +/-   ##
=============================================
- Coverage   88.912%   88.835%   -0.078%     
=============================================
  Files           92        92               
  Lines         7017      7022        +5     
  Branches      1196      1197        +1     
=============================================
- Hits          6239      6238        -1     
- Misses         533       537        +4     
- Partials       245       247        +2     

Impacted Files	Coverage Δ
sanic/http/http3.py	79.891% <66.666%> (-0.665%)	⬇️
sanic/asgi.py	91.666% <100.000%> (-0.063%)	⬇️
sanic/http/http1.py	84.353% <100.000%> (+0.107%)	⬆️
sanic/request/types.py	94.236% <100.000%> (+0.016%)	⬆️

... and 1 file with indirect coverage changes

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