to_hetero: BasicGNN support

[rusty1s]

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[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@760dd5a). Click here to learn what that means.
The diff coverage is 97.14%.

❗ Current head b584de4 differs from pull request most recent head deac5a4. Consider uploading reports for the commit deac5a4 to get more accurate results

@@            Coverage Diff            @@
##             master    #5091   +/-   ##
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  Coverage          ?   82.99%           
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  Files             ?      332           
  Lines             ?    18326           
  Branches          ?        0           
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  Hits              ?    15209           
  Misses            ?     3117           
  Partials          ?        0           

Impacted Files	Coverage Δ
torch_geometric/nn/models/basic_gnn.py	89.71% <96.77%> (ø)
torch_geometric/nn/to_hetero_transformer.py	95.37% <100.00%> (ø)

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