MAINT remove deprecated params for 0.13

[glemaitre]

Remove deprecated parameters and address other TODO for imbalanced-learn 0.13 release.

[codecov]

Codecov Report

Attention: Patch coverage is 85.71429% with 2 lines in your changes missing coverage. Please review.

Project coverage is 93.91%. Comparing base (e32819e) to head (aae4f04).
Report is 22 commits behind head on master.

Files with missing lines	Patch %	Lines
imblearn/ensemble/_forest.py	33.33%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1112      +/-   ##
==========================================
+ Coverage   92.98%   93.91%   +0.93%     
==========================================
  Files         105       54      -51     
  Lines        8323     3634    -4689     
  Branches     1288      486     -802     
==========================================
- Hits         7739     3413    -4326     
+ Misses        465      124     -341     
+ Partials      119       97      -22     

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