Remove meta device utilities in favor of torchdistx

[carmocca]

What does this PR do?

See https://github.com/pytorch/torchdistx

Fixes #13796
Fixes #13660
Closes #13763

Does your PR introduce any breaking changes? If yes, please list them.

Removes the experimental code for meta tensor materialization.

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cc @Borda @justusschock @awaelchli @rohitgr7 @tchaton @akihironitta

[carmocca]

Converting to draft while I address the dependency issues

[carmocca]

Since this is all very experimental, I decided not to add the dependency. It's very tricky choosing the ABI version dynamically. And it's only released with PyTorch 1.12 compatibility.

[codecov]

Codecov Report

Merging #13868 (8fc8900) into master (0883971) will decrease coverage by 3%.
The diff coverage is 83%.

@@            Coverage Diff             @@
##           master   #13868      +/-   ##
==========================================
- Coverage      80%      76%      -3%     
==========================================
  Files         103      323     +220     
  Lines        6858    26356   +19498     
==========================================
+ Hits         5462    20116   +14654     
- Misses       1396     6240    +4844     

[tchaton]

LGTM !