MAINT validate parameters for public functions

[glemaitre]

Some parameter validation but this time for the public functions.

[codecov]

Codecov Report

Base: 96.15% // Head: 96.00% // Decreases project coverage by -0.14% ⚠️

Coverage data is based on head (2506fc8) compared to base (f8c27ae).
Patch coverage: 90.54% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #956      +/-   ##
==========================================
- Coverage   96.15%   96.00%   -0.15%     
==========================================
  Files          99      100       +1     
  Lines        6894     6940      +46     
  Branches      994     1014      +20     
==========================================
+ Hits         6629     6663      +34     
- Misses        163      169       +6     
- Partials      102      108       +6     

Impacted Files	Coverage Δ
imblearn/datasets/tests/test_imbalance.py	100.00% <ø> (ø)
imblearn/utils/_param_validation.py	95.61% <0.00%> (-1.16%)	⬇️
imblearn/utils/tests/test_param_validation.py	99.52% <ø> (-0.02%)	⬇️
imblearn/datasets/_imbalance.py	70.58% <75.00%> (-2.75%)	⬇️
imblearn/tests/test_public_functions.py	87.80% <87.80%> (ø)
imblearn/datasets/_zenodo.py	91.80% <100.00%> (+0.27%)	⬆️
imblearn/metrics/_classification.py	91.20% <100.00%> (-0.59%)	⬇️
imblearn/pipeline.py	95.09% <100.00%> (+0.53%)	⬆️
imblearn/tests/test_pipeline.py	99.11% <100.00%> (-0.01%)	⬇️
... and 1 more

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