Enable typing support

[akihironitta]

Addresses #3429 (reply in thread).
Related to #5657.

Package maintainers who wish to support type checking of their code MUST add a marker file named py.typed to their package supporting typing. This marker applies recursively: if a top-level package includes it, all its sub-packages MUST support type checking as well.

https://peps.python.org/pep-0561/#packaging-type-information

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (4f379d7) 88.30% compared to head (31b247b) 88.30%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8254      +/-   ##
==========================================
- Coverage   88.30%   88.30%   -0.01%     
==========================================
  Files         479      479              
  Lines       29645    29645              
==========================================
- Hits        26178    26177       -1     
- Misses       3467     3468       +1     

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[akihironitta]

I'm not very familiar with TorchScript, but it seems like there's an issue with around annotations for TorchScript:

pytorch_geometric/torch_geometric/nn/conv/edge_conv.py

Lines 116 to 120 in 699120e

	def forward(
	self, x: Union[Tensor, PairTensor],
	batch: Union[OptTensor, Optional[PairTensor]] = None) -> Tensor:
	# type: (Tensor, OptTensor) -> Tensor # noqa
	# type: (PairTensor, Optional[PairTensor]) -> Tensor # noqa

$ mypy
torch_geometric/nn/conv/edge_conv.py:120: error: expected an indented block  [syntax]
Found 1 error in 1 file (errors prevented further checking)

https://github.com/pyg-team/pytorch_geometric/actions/runs/7072892589/job/19252222130?pr=8254

---

I would appreciate any help from the PyG community ❤️

[rusty1s]

Thanks @akihironitta. I fixed the # type: issue.

[rusty1s]

Commenting out the pre-commit check for now due to bunch of errors, but I think it is good to get this PR in.