Explainability Dataset Task: GridGraph

[shenoynikhil]

Adds GridGraph. Fixes task #5817.

from torch_geometric.datasets.generators import GridGraph

motif = Motif(structure='house')
generator = GridGraph(height=10, width=10, dtype=torch.float)
dataset = ExplainerDataset(generator=generator)

TODO

• Tests
• ChangeLog

[codecov]

Codecov Report

Merging #6220 (5962c2c) into master (56698a7) will not change coverage.
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##           master    #6220   +/-   ##
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  Coverage   84.51%   84.51%           
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  Files         372      372           
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  Hits        17584    17584           
  Misses       3221     3221           

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[shenoynikhil]

@rusty1s Maybe you can have a look at this PR.

[rusty1s]

Thank you, this is great :)