[FR]: Support for pyi files?

### What is the current behavior?

Hi,

rules_python has support for `pyi_srcs`. I saw that however aspect rules_py does not have that.
For the time being I am adding the `.pyi` files to the `data` field, but I wonder if adding `pyi_srcs` would be helpful?

### Describe the feature

It would also be nice to allow `aspect configure` to understand `.pyi` files too and put them in the same library too.

Thank you!