[Feature] Implement FTRL optimizer

[kozistr]

Problem (Why?)

implement FTRL optimizer

Solution (What/How?)

• implement FTRL optimizer

Other changes (bug fixes, small refactors)

N/A

Notes

N/A

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (3c22ca1) to head (39ade74).
Report is 16 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #291   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           95        96    +1     
  Lines         7340      7394   +54     
=========================================
+ Hits          7340      7394   +54     

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