Add CodSpeed performance benchmarks

[codspeed-hq]

Summary

• Integrated CodSpeed for continuous performance monitoring
• Added pytest-codspeed (v4.3.0) to test dependencies
• Created 17 benchmarks across 2 test files covering core operations:
  • Expression compilation: equality, regex, startswith, compile_many, unpack
  • Q operator construction: equality/comparison operators, in/not_in, logical operators (and/or), ordering
  • Document model operations: EmbeddedDocument instantiation and serialization (model_dump, model_dump_json), nested document creation, Movie model instantiation and serialization
• Added GitHub Actions workflow (.github/workflows/codspeed.yml) with:
  • OIDC authentication (no token needed)
  • CPU simulation mode for deterministic measurements
  • Runs on push to main, pull requests, and manual dispatch
• Added CodSpeed badge to README

Next steps

• Review benchmark results on pull requests via CodSpeed's automated comments
• Add more benchmarks as new features are developed (e.g., database CRUD operations with MongoDB service)
• Consider enabling performance checks to prevent regressions on merge

[codspeed-hq]

Congrats! CodSpeed is installed 🎉

🆕 17 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_bench_embedded_document_instantiation: 17.2 ms
• test_bench_expression_compile_startswith: 657.7 µs
• test_bench_q_in_operator: 645.6 µs
• test_bench_embedded_document_model_dump_json: 1.3 ms
• test_bench_embedded_document_model_dump: 891.7 µs
• test_bench_embedded_document_with_nested: 59.8 ms
• test_bench_q_operator_construction: 1.8 ms
• test_bench_q_logical_operators: 762.7 µs
• test_bench_movie_model_instantiation: 29.8 ms
• test_bench_q_ordering: 658.2 µs
• test_bench_expression_compile_eq: 709.6 µs
• test_bench_sort_expression_compile: 180.5 µs
• test_bench_expression_compile_many: 5.8 ms
• test_bench_expression_compile_regex: 707.1 µs
• test_bench_movie_model_dump: 1.8 ms
• test_bench_expression_unpack: 1.2 ms
• test_bench_document_model_dump_with_nested: 4.6 ms

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