Add Python auto-instrument entry point

[haasonsaas]

Summary

• Register a Python opentelemetry_instrumentor entry point backed by Eval2OtelInstrumentor, so opentelemetry-instrument can discover the instrument_all() path.
• Add optional Pydantic validation models in eval2otel.models without making Pydantic a base dependency.
• Document zero-code usage, validation extras, and align Python package metadata with the local Python 3.9-compatible test surface.

Test plan

• npm run lint
• npm run build
• npx tsc --noEmit
• npm test -- --coverage
• npm audit --omit=dev
• PYTHONPATH=python python3 -m unittest discover -s python/tests
• python3 -m pip install -e python --dry-run
• npm pack --dry-run

Refs #2

[github-actions]

Package	Line Rate	Branch Rate	Complexity	Health
src	96%	83%	0	✔
src.integrations	95%	75%	0	✔
Summary	96% (1122 / 1171)	81% (900 / 1107)	0	✔

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	pypi/​opentelemetry-instrumentation@​0.62b1
	pypi/​pydantic@​2.13.4

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