torch.compile benchmark for HeteroConv; Allow device conversions of datasets

[rusty1s]

+----------+-----------+------------+---------+
| Name     | Forward   | Backward   | Total   |
|----------+-----------+------------+---------|
| Vanilla  | 2.0331s   | 0.5175s    | 2.5505s |
| Compiled | 0.6899s   | 0.6946s    | 1.3844s |
+----------+-----------+------------+---------+

[codecov]

Codecov Report

Attention: 12 lines in your changes are missing coverage. Please review.

Comparison is base (cf24b4b) 88.36% compared to head (11c1e25) 87.71%.
Report is 2 commits behind head on master.

Files	Patch %	Lines
torch_geometric/data/in_memory_dataset.py	20.00%	12 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8402      +/-   ##
==========================================
- Coverage   88.36%   87.71%   -0.66%     
==========================================
  Files         475      475              
  Lines       28894    28918      +24     
==========================================
- Hits        25532    25364     -168     
- Misses       3362     3554     +192     

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