Add codspeed benchmarks

[bdraco]

We are planning on merging free-threading support in #1015 but have no good way to test this does not regress performance. Add benchmarks ahead of merge so we can get a test in the CI

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.86%. Comparing base (88ac22c) to head (938512a).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1029      +/-   ##
==========================================
+ Coverage   94.30%   94.86%   +0.55%     
==========================================
  Files          22       23       +1     
  Lines        2425     2686     +261     
  Branches      227      254      +27     
==========================================
+ Hits         2287     2548     +261     
  Misses         67       67              
  Partials       71       71              

Flag	Coverage Δ
CI-GHA	94.86% <100.00%> (+0.55%)	⬆️
MyPy	67.51% <70.49%> (+0.32%)	⬆️
pytest	98.11% <100.00%> (+0.23%)	⬆️

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[codspeed-hq]

CodSpeed Performance Report

Congrats! CodSpeed is installed 🎉

🆕 38 new benchmarks were detected.

You will start to see performance impacts in the reports once the benchmarks are run from your default branch.

Detected benchmarks

• test_cimultidict_add_istr_performance (81.3 µs)
• test_cimultidict_add_str_performance (106.4 µs)
• test_cimultidict_clear_str_performance (14.2 µs)
• test_cimultidict_delitem_istr_performance (112.3 µs)
• test_cimultidict_delitem_str_performance (160.8 µs)
• test_cimultidict_extend_istr_performance (145.6 µs)
• test_cimultidict_extend_str_performance (184.5 µs)
• test_cimultidict_fetch_istr_performance (60.3 µs)
• test_cimultidict_fetch_str_performance (84.7 µs)
• test_cimultidict_get_hit_performance (117.4 µs)
• test_cimultidict_get_hit_with_default_performance (124.7 µs)
• test_cimultidict_get_istr_hit_performance (93.8 µs)
• test_cimultidict_get_istr_hit_with_default_performance (100.9 µs)
• test_cimultidict_get_istr_miss_performance (151.8 µs)
• test_cimultidict_get_istr_with_default_miss_performance (159.2 µs)
• test_cimultidict_get_miss_performance (176.6 µs)
• test_cimultidict_get_miss_with_default_performance (185.1 µs)
• test_cimultidict_getall_istr_hit_performance (33.8 µs)
• test_cimultidict_getall_str_hit_performance (40.9 µs)
• test_cimultidict_insert_istr_performance (68.7 µs)
• test_cimultidict_insert_str_performance (99.9 µs)
• test_cimultidict_pop_istr_performance (129.9 µs)
• test_cimultidict_pop_str_performance (177.3 µs)
• test_cimultidict_popitem_str_performance (98.2 µs)
• test_cimultidict_update_istr_performance (156.8 µs)
• test_cimultidict_update_str_performance (184.4 µs)
• test_multidict_add_str_performance (76.7 µs)
• test_multidict_clear_str_performance (14.2 µs)
• test_multidict_delitem_str_performance (103.7 µs)
• test_multidict_extend_str_performance (185.7 µs)
• test_multidict_fetch_performance (54.9 µs)
• test_multidict_get_hit_performance (87.4 µs)
• test_multidict_get_miss_performance (147.1 µs)
• test_multidict_getall_str_hit_performance (33 µs)
• test_multidict_insert_str_performance (70.1 µs)
• test_multidict_pop_str_performance (120.6 µs)
• test_multidict_popitem_str_performance (98.1 µs)
• test_multidict_update_str_performance (151.6 µs)

[bdraco]

RTD build failed for some reason and I can't get it to run so doing another PR #1030