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