[doc] Move each profiler to its own file + Add missing PyTorchProfiler to the doc

[tchaton]

What does this PR do?

Fixes #7806

Before submitting

• Was this discussed/approved via a GitHub issue? (not for typos and docs)
• Did you read the contributor guideline, Pull Request section?
• Did you make sure your PR does only one thing, instead of bundling different changes together?
• Did you make sure to update the documentation with your changes? (if necessary)
• Did you write any new necessary tests? (not for typos and docs)
• Did you verify new and existing tests pass locally with your changes?
• Did you update the CHANGELOG? (not for typos, docs, test updates, or internal minor changes/refactorings)

PR review

Anyone in the community is free to review the PR once the tests have passed.
Before you start reviewing make sure you have read Review guidelines. In short, see the following bullet-list:

• Is this pull request ready for review? (if not, please submit in draft mode)
• Check that all items from Before submitting are resolved
• Make sure the title is self-explanatory and the description concisely explains the PR
• Add labels and milestones (and optionally projects) to the PR so it can be classified

Did you have fun?

Make sure you had fun coding 🙃

[codecov]

Codecov Report

Merging #7822 (8d4a299) into master (36770b2) will decrease coverage by 0%.
The diff coverage is 97%.

@@          Coverage Diff           @@
##           master   #7822   +/-   ##
======================================
- Coverage      93%     92%   -0%     
======================================
  Files         199     202    +3     
  Lines       13016   13039   +23     
======================================
- Hits        12051   12036   -15     
- Misses        965    1003   +38     

[awaelchli]

imports may brake for some people who do not import at top level from init file

[tchaton]

imports may brake for some people who do not import at top level from init file

Hey @awaelchli. Added a depreciation call.

Best,
T.C

[Borda]

Is it rename files or adding new code, from the PR diff it is not clear...

[tchaton]

Is it rename files or adding new code, from the PR diff it is not clear...

This PR extracts each profiler from profilers.py and move it to simple.py, advanced.py, etc..

Best,
T.C