Add typing_extensions support for python 3.7

[pdx97]

🚀 The feature, motivation and pitch

Please Add typing_extensions support for python version 3.7

• Traceback (most recent call last): File "torchbeast/monobeast.py", line 19, in from agent.geometric.gnnagent import GNNAgent File "/home/pdx/Desktop/GTG/agent/geometric/gnnagent.py", line 4, in from pytorch_geometric.torch_geometric.nn import RGCNConv, FastRGCNConv File "/home/pdx/Desktop/GTG/pytorch_geometric/torch_geometric/init.py", line 2, in from .edge_index import EdgeIndex File "/home/pdx/Desktop/GTG/pytorch_geometric/torch_geometric/edge_index.py", line 4, in from typing import ( ImportError: cannot import name 'Literal' from 'typing' (/home/pdx/anaconda3/envs/GTG_1/lib/python3.7/typing.py)

Alternatives

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Additional context

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[akihironitta]

Since many projects already dropped Python 3.7 support as per NEP 29, it may not make sense to have the support back in PyG.

I'd simply recommend using an older version of PyG if you'd like to use Python 3.7.