[python] Add TurboAPI framework

[remittor]

PR Commands — comment on this PR to trigger (requires collaborator approval):

Command	Description
/benchmark -f <framework>	Run all benchmark tests
/benchmark -f <framework> -t <test>	Run a specific test
/benchmark -f <framework> --save	Run and save results (updates leaderboard on merge)

Always specify -f <framework>. Results are automatically compared against the current leaderboard.

[remittor]

This is crap code written by AI !!!

[remittor]

I fixed everything I could. But this is beyond my competence:

[ready] Server is up
[test] baseline endpoints
  PASS [GET /baseline11?a=13&b=42]
  PASS [POST /baseline11?a=13&b=42 body=20]
  FAIL [POST /baseline11?a=13&b=42 chunked body=20]: expected body '75', got '{"error": "Transfer-Encoding not supported"}'
        → https://www.http-arena.com/docs/test-profiles/h1/isolated/baseline/validation
[test] baseline anti-cheat (randomized inputs)
  PASS [GET /baseline11?a=866&b=384 (random)]
  PASS [POST body=627 (cache check 1)]
  PASS [POST body=472 (cache check 2)]
[test] pipelined endpoint
  PASS [GET /pipeline]
[test] json endpoint
  PASS [GET /json/{count}?m=X] (4 counts with multipliers verified)
  PASS [GET /json Content-Type] (Content-Type: application/json)
[test] json-comp endpoint
  PASS [json-comp Content-Encoding: gzip]
  PASS [json-comp response] (3 counts with multipliers, compressed)
  PASS [json-comp per-request] (no Content-Encoding without Accept-Encoding)
=== Results: 11 passed, 1 failed ===
httparena-validate-turboapi
Error: Process completed with exit code 1.

[remittor]

@justrach, should we expect support for chunked body in the future?