[FEATURE] Add Semi-SL multilabel classification algorithm

[sovrasov]

• SemiSL for multilabel classification with BT loss and adaptive loss weighting
• Docs
• CLI test
• Unit test

Future work:

• Add SemiSL to regression tests

[codecov-commenter]

Codecov Report

Patch coverage: 91.07% and project coverage change: +0.07 🎉

Comparison is base (6a3349b) 80.66% compared to head (56d22b9) 80.73%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1805      +/-   ##
===========================================
+ Coverage    80.66%   80.73%   +0.07%     
===========================================
  Files          486      488       +2     
  Lines        33249    33361     +112     
===========================================
+ Hits         26819    26934     +115     
+ Misses        6430     6427       -3     

Impacted Files	Coverage Δ
otx/cli/manager/config_manager.py	84.98% <ø> (ø)
...modules/models/heads/semisl_multilabel_cls_head.py	90.90% <90.90%> (ø)
...models/classifiers/semisl_multilabel_classifier.py	91.66% <91.66%> (ø)

... and 5 files with indirect coverage changes

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[sungmanc]

LGTM

[harimkang]

I think this is great work!
The only thing I would say is that the E2E test is missing. Other than that, I have no comments.

[kprokofi]

LGTM