chore: Rename _typing.*Cudf* aliases to *CuDF*

[dangotbanned]

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

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

Related issues

• Follow-up to feat(typing): Make Implementation less opaque #3016
• Doesn't quite fit into refactor(typing): Add _native.py #3086

Checklist

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

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

CuDF is closer to cuDF than Cudf 🙂

Aligns with the spelling used for these, which came before the aliases in (2ad79a9)

narwhals/narwhals/_namespace.py

Lines 98 to 102 in 8d241c8

	class _CuDFDataFrame(_BasePandasLikeFrame, Protocol):
	def to_pylibcudf(self, *args: Any, **kwds: Any) -> Any: ...
	class _CuDFSeries(_BasePandasLikeSeries, Protocol):
	def to_pylibcudf(self, *args: Any, **kwds: Any) -> Any: ...

narwhals/narwhals/_namespace.py

Line 127 in 8d241c8

_NativeCuDF: TypeAlias = "_CuDFDataFrame | _CuDFSeries"

narwhals/narwhals/_namespace.py

Lines 310 to 314 in 8d241c8

	@overload
	@classmethod
	def from_native_object(
	cls, native: _NativeCuDF, /
	) -> Namespace[PandasLikeNamespace[_CuDFDataFrame, _CuDFSeries]]: ...

[FBruzzesi]

Thanks @dangotbanned