OnDiskDataset class with Database integration

[jay-bhambhani]

No description provided.

[codecov]

Codecov Report

Merging #8066 (574226a) into master (4265438) will decrease coverage by 0.68%.
Report is 1 commits behind head on master.
The diff coverage is 97.14%.

❗ Current head 574226a differs from pull request most recent head 1ab8133. Consider uploading reports for the commit 1ab8133 to get more accurate results

@@            Coverage Diff             @@
##           master    #8066      +/-   ##
==========================================
- Coverage   89.23%   88.55%   -0.68%     
==========================================
  Files         466      467       +1     
  Lines       27812    27875      +63     
==========================================
- Hits        24817    24685     -132     
- Misses       2995     3190     +195     

Files Changed	Coverage Δ
torch_geometric/data/dataset.py	93.90% <ø> (ø)
torch_geometric/data/in_memory_dataset.py	98.05% <ø> (ø)
torch_geometric/data/on_disk_dataset.py	96.96% <96.96%> (ø)
torch_geometric/data/__init__.py	100.00% <100.00%> (ø)
torch_geometric/nn/models/node2vec.py	94.11% <100.00%> (ø)

... and 32 files with indirect coverage changes

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