Specify Any for PyGraph and PyDiGraph type annotations for pyright compatibility

[IvanIsCoding]

Closes #1242

This is a pretty annoying PR but it avoids pyright from infering the types as Unknown. Although we will only keep mypy in the CI, pyright is the base for pylance which ships with VSCode. And we got VSCode issues in the past (#832), so I think it's worth supporting.

[coveralls]

Pull Request Test Coverage Report for Build 11862655294

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 95.834%

---

Totals
Change from base Build 11860433299:	0.0%
Covered Lines:	18125
Relevant Lines:	18913

---

💛 - Coveralls

[mtreinish]

Just one question inline about using the generic type var instead Any. But if that doesn't work I'm fine with this.

[mtreinish]

So based on the earlier comment is this actually [Any, Any]. The weights from the generator functions are a fixed type depending on the arguments. Like for this gnm random graph function the nodes and edges are always None.