Add OR support for OData filters

[wilsonfreitas]

Summary

• Add composable OData filter expressions with | for OR and & for explicit AND.
• Keep existing multiple-filter behavior as implicit AND.
• Raise a clear TypeError when filters are used in Python boolean context, so native and/or does not silently produce the wrong query.
• Document OR usage in OData docs.

Fixes #11

Verification

• uv run pytest tests/test_odata.py tests/test_async.py
• uv run ruff check bcb/ tests/
• uv run ruff format --check bcb/ tests/
• uv run mypy bcb/
• uv run pytest -m "not integration"
• uv run --group docs sphinx-build -b html docs docs/_build/html
• uv run pytest -m integration
• git diff --check