to_nested_tensor and from_nested_tensor functionality

[rusty1s]

No description provided.

[codecov]

Codecov Report

Merging #6329 (afe495f) into master (78bba36) will decrease coverage by 1.98%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #6329      +/-   ##
==========================================
- Coverage   86.30%   84.32%   -1.99%     
==========================================
  Files         386      387       +1     
  Lines       21515    21360     -155     
==========================================
- Hits        18569    18012     -557     
- Misses       2946     3348     +402     

Impacted Files	Coverage Δ
torch_geometric/utils/__init__.py	100.00% <100.00%> (ø)
torch_geometric/utils/nested.py	100.00% <100.00%> (ø)
torch_geometric/nn/models/dimenet_utils.py	0.00% <0.00%> (-75.52%)	⬇️
torch_geometric/nn/models/dimenet.py	14.51% <0.00%> (-53.15%)	⬇️
torch_geometric/visualization/graph.py	68.25% <0.00%> (-26.99%)	⬇️
torch_geometric/profile/profile.py	33.33% <0.00%> (-25.39%)	⬇️
torch_geometric/nn/conv/utils/typing.py	83.75% <0.00%> (-15.00%)	⬇️
torch_geometric/nn/pool/asap.py	92.00% <0.00%> (-8.00%)	⬇️
torch_geometric/nn/inits.py	67.85% <0.00%> (-7.15%)	⬇️
torch_geometric/resolver.py	82.75% <0.00%> (-6.90%)	⬇️
... and 66 more

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