Improve performance of the URL.extend_query method

[bdraco]

Improve performance of extend_query

[codspeed-hq]

CodSpeed Performance Report

Merging #1305 will improve performances by 43.76%

_{Comparing extend_query_performance (a86ad84) with master (fa83191)}

Summary

⚡ 3 improvements
✅ 62 untouched benchmarks

Benchmarks breakdown

	Benchmark	master	extend_query_performance	Change
⚡	test_url_extend_query_existing_query_simple_query_dict	786.3 µs	686 µs	+14.63%
⚡	test_url_extend_query_existing_query_string	333.6 µs	232.1 µs	+43.76%
⚡	test_url_extend_query_simple_query_dict	759.4 µs	658.3 µs	+15.36%

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.90%. Comparing base (fa83191) to head (a86ad84).
Report is 146 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1305      +/-   ##
==========================================
- Coverage   95.90%   95.90%   -0.01%     
==========================================
  Files          27       27              
  Lines        5323     5322       -1     
  Branches      320      319       -1     
==========================================
- Hits         5105     5104       -1     
  Misses        192      192              
  Partials       26       26              

Flag	Coverage Δ
CI-GHA	95.90% <100.00%> (-0.01%)	⬇️
MyPy	44.30% <85.71%> (-0.02%)	⬇️
OS-Linux	99.30% <100.00%> (-0.01%)	⬇️
OS-Windows	99.36% <100.00%> (-0.01%)	⬇️
OS-macOS	99.03% <100.00%> (-0.01%)	⬇️
Py-3.10.11	99.00% <100.00%> (-0.01%)	⬇️
Py-3.10.15	99.26% <100.00%> (-0.01%)	⬇️
Py-3.11.10	99.26% <100.00%> (-0.01%)	⬇️
Py-3.11.9	99.00% <100.00%> (-0.01%)	⬇️
Py-3.12.7	99.26% <100.00%> (-0.01%)	⬇️
Py-3.13.0	99.26% <100.00%> (-0.01%)	⬇️
Py-3.9.13	98.96% <100.00%> (-0.01%)	⬇️
Py-3.9.20	99.21% <100.00%> (-0.01%)	⬇️
Py-pypy7.3.16	99.26% <100.00%> (-0.01%)	⬇️
Py-pypy7.3.17	99.28% <100.00%> (-0.01%)	⬇️
VM-macos-latest	99.03% <100.00%> (-0.01%)	⬇️
VM-ubuntu-latest	99.30% <100.00%> (-0.01%)	⬇️
VM-windows-latest	99.36% <100.00%> (-0.01%)	⬇️
pytest	99.30% <100.00%> (-0.01%)	⬇️

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