fix: mark package as typed

[rlippmann]

What changed

• Added the py.typed marker to the context_compiler package.
• Updated Hatch wheel packaging so context_compiler/py.typed is included in built wheels.
• Bumped the package version to 0.7.10.

Why

• Downstream projects running mypy against the installed wheel currently see context_compiler as untyped.
• This marks the package as typed for PEP 561-aware type checkers.
• The fix was exposed while using context-compiler as an installed dependency from the example integrations repo.

Checklist

• pre-commit run (uv run pre-commit run --all-files)
• tests pass (uv run pytest)