No longer using setuptools and importlib as direct dependencies

[apetenchea]

Note

Versioning and headers

• Add arango/version.py with __version__ = "8.2.6" and use it in client.version and request.normalize_headers (replacing hardcoded version)

Packaging and dependencies

• Remove runtime deps on importlib_metadata and setuptools; update pyproject.toml to derive version from arango.version.__version__, require Python >=3.10, and clean dependencies
• Drop importlib_metadata from docs/requirements.txt

Tooling

• Bump pre-commit hooks: black 26.1.0, flake8 7.3.0

Tests and minor fixes

• Update tests to assert against arango.version.__version__
• Minor formatting/typing comment tweaks in collection.py and tests

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