Performance regression tests in CI

[simontaurus]

Add performance regression tests to CI. Track serialization/query times across commits.

Acceptance Criteria

• Performance benchmarks in CI
• Tracking of serialization times across commits
• Tracking of query times across commits
• Alerts on significant regressions

[raederan]

CI Benchmark (for instance #22 (comment)):

• compare version PR source and targent
• auto comment in PR

[raederan]

What is the initial benchmark setup?

existing benchmarking

oold-python/pytest.benchmark.ini

Line 11 in 9efac03

--benchmark-timer=time.perf_counter

see example
#95 (comment)

• Comparison "feature branch" vs "main" within PR functional?
• Negative example implementation, e.g., using "sleep" to test benchmarking
• Optimization of Benchmarking in general (if possible and optional)