[references] Add poly scheduler for detection training

[felixdittrich92]

This PR:

• Add Polynomial Scheduler for detection training (TF & PT)
• It's often mentioned in text detection papers like DB & FAST & .. so i think it is a good idea to add it :)

Any feedback is welcome 🤗

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (f5445ef) 95.81% compared to head (c996c1b) 95.80%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1444      +/-   ##
==========================================
- Coverage   95.81%   95.80%   -0.02%     
==========================================
  Files         162      162              
  Lines        7101     7101              
==========================================
- Hits         6804     6803       -1     
- Misses        297      298       +1     

Flag	Coverage Δ
unittests	95.80% <100.00%> (-0.02%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[felixdittrich92]

@odulcy-mindee I think with choices it's more clean instead of raising an exception :)
Switched the default to poly -> (After testing LinkNet / DB & FAST on 2 different detection datasets x Poly / Cosine / Onecycle -> Poly has reached the best results with mostly no drops)

[odulcy-mindee]

Yeah, it's better with choices, thanks !