[doc] Add QAT tutorial

[andrewor14]

[pytorch-bot]

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[andrewor14]

Note: This should be landed after #980, which is currently blocked on the torchao 0.3 release.

[ebsmothers]

This was the hang issue, right? Would be interested to see if we still see it running on FSDP2

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 26.57%. Comparing base (52e3283) to head (9ab129f).
Report is 1 commits behind head on main.

❗ There is a different number of reports uploaded between BASE (52e3283) and HEAD (9ab129f). Click for more details.

HEAD has 3 uploads less than BASE

| Flag | BASE (52e3283) | HEAD (9ab129f) | |------|------|------| ||4|1|

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #1105       +/-   ##
===========================================
- Coverage   66.69%   26.57%   -40.12%     
===========================================
  Files         184      184               
  Lines        8578     8572        -6     
===========================================
- Hits         5721     2278     -3443     
- Misses       2857     6294     +3437     

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