Introduce torch_geometric.Index

[rusty1s]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 51.64835% with 44 lines in your changes are missing coverage. Please review.

Project coverage is 86.75%. Comparing base (01e8303) to head (c02e2fb).
Report is 14 commits behind head on master.

Files	Patch %	Lines
torch_geometric/index.py	47.56%	43 Missing ⚠️
torch_geometric/edge_index.py	88.88%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #9276      +/-   ##
==========================================
+ Coverage   85.22%   86.75%   +1.52%     
==========================================
  Files         459      460       +1     
  Lines       29951    30045      +94     
==========================================
+ Hits        25526    26065     +539     
+ Misses       4425     3980     -445     

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