Use faster Python unicode API for unquoter

[bdraco]

Every character that was being iterated during unquote was calling __Pyx_GetItemInt_Unicode

Its a bit faster to use PyUnicode_READ instead

[codspeed-hq]

CodSpeed Performance Report

Merging #1292 will improve performances by 8.19%

_{Comparing avoid_malloc_nothing_to_quote_c_api_unquoter (17f2da3) with master (e776a70)}

Summary

⚡ 2 improvements
✅ 54 untouched benchmarks

Benchmarks breakdown

	Benchmark	master	avoid_malloc_nothing_to_quote_c_api_unquoter	Change
⚡	test_unquoter_long_ascii	7.2 ms	6.6 ms	+8.19%
⚡	test_unquoter_long_pct	7.4 ms	6.9 ms	+7.41%

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.85%. Comparing base (e776a70) to head (17f2da3).
Report is 157 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1292   +/-   ##
=======================================
  Coverage   95.85%   95.85%           
=======================================
  Files          27       27           
  Lines        5261     5263    +2     
  Branches      311      311           
=======================================
+ Hits         5043     5045    +2     
  Misses        192      192           
  Partials       26       26           

Flag	Coverage Δ
CI-GHA	95.85% <100.00%> (+<0.01%)	⬆️
MyPy	44.14% <ø> (ø)
OS-Linux	99.30% <100.00%> (+<0.01%)	⬆️
OS-Windows	99.35% <ø> (ø)
OS-macOS	99.02% <100.00%> (+<0.01%)	⬆️
Py-3.10.11	98.99% <100.00%> (+<0.01%)	⬆️
Py-3.10.15	99.25% <100.00%> (+<0.01%)	⬆️
Py-3.11.10	99.25% <100.00%> (+<0.01%)	⬆️
Py-3.11.9	98.99% <100.00%> (+<0.01%)	⬆️
Py-3.12.7	99.25% <100.00%> (+<0.01%)	⬆️
Py-3.13.0	99.25% <100.00%> (+<0.01%)	⬆️
Py-3.9.13	98.95% <100.00%> (+<0.01%)	⬆️
Py-3.9.20	99.20% <100.00%> (+<0.01%)	⬆️
Py-pypy7.3.16	99.25% <ø> (ø)
Py-pypy7.3.17	99.28% <ø> (ø)
VM-macos-latest	99.02% <100.00%> (+<0.01%)	⬆️
VM-ubuntu-latest	99.30% <100.00%> (+<0.01%)	⬆️
VM-windows-latest	99.35% <ø> (ø)
pytest	99.30% <100.00%> (+<0.01%)	⬆️

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[bdraco]

We don't have any benchmarks for accessing the properties that need to go through the unquoter

[bdraco]

could be faster if no change as well