chore(typing): add CompliantExpr._version

[dangotbanned]

What type of PR is this? (check all applicable)

• 💾 Refactor
• ✨ Feature
• 🐛 Bug Fix
• 🔧 Optimization
• 📝 Documentation
• ✅ Test
• 🐳 Other

Related issues

• Mentioned in https://discord.com/channels/1235257048170762310/1272835922924273694/1342486928250900570

Checklist

• Code follows style guide (ruff)
• Tests added
• Documented the changes

If you have comments or can explain your changes, please do so below

All implementors of the protocol already define this, meaning CompliantExpr can now match _FullContext

narwhals/narwhals/utils.py

Lines 77 to 100 in 4dda548

	class _StoresImplementation(Protocol):
	_implementation: Implementation
	"""Implementation of native object (pandas, Polars, PyArrow, ...)."""
	class _StoresBackendVersion(Protocol):
	_backend_version: tuple[int, ...]
	"""Version tuple for a native package."""
	class _StoresVersion(Protocol):
	_version: Version
	"""Narwhals API version (V1 or MAIN)."""
	class _LimitedContext(_StoresBackendVersion, _StoresVersion, Protocol):
	"""Provides 2 attributes.
	- `_backend_version`
	- `_version`
	"""
	class _FullContext(_StoresImplementation, _LimitedContext, Protocol): # noqa: PYI046
	"""Provides 3 attributes.
	- `_implementation`
	- `_backend_version`

[MarcoGorelli]

thanks @dangotbanned !