Add protocols for `LazyExpr*Namespace`

[dangotbanned]

Originally posted by @dangotbanned in #2000 (comment)

Realised while reviewing (#2000) that we're not enforcing the newer-style protocols for most ofLazyExpr.
The one exception being LazyExprNameNamespace.

narwhals/narwhals/_compliant/expr.py

Lines 904 to 910 in 3d92e0d

	@property
	def name(self) -> LazyExprNameNamespace[Self]:
	return LazyExprNameNamespace(self)
	class _ExprNamespace( # type: ignore[misc]
	_StoresCompliant[CompliantExprT_co], Protocol[CompliantExprT_co]

Everything else is Any, which IIRC was for the benefit of not_implemented 🤔

narwhals/narwhals/_compliant/expr.py

Lines 282 to 293 in 3d92e0d

	@property
	def str(self) -> Any: ...
	@property
	def name(self) -> Any: ...
	@property
	def dt(self) -> Any: ...
	@property
	def cat(self) -> Any: ...
	@property
	def list(self) -> Any: ...
	@property
	def struct(self) -> Any: ...

Related

• refactor: adds _compliant sub-package #2149
• chore: Add EagerSeries*Namespace protocols #2294
• refactor: Add LazyExprNameNamespace #2311