Fix StaticSMOTE pipeline API

[damianhorna]

This PR fixes Static SMOTE pipeline API, i.e. it enables to call fit_resample on that method and extends BaseSampler.

[codecov-commenter]

Codecov Report

Merging #72 (b1cb3a1) into develop (ea605d2) will increase coverage by 0.04%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop      #72      +/-   ##
===========================================
+ Coverage    97.40%   97.44%   +0.04%     
===========================================
  Files           27       27              
  Lines         1654     1681      +27     
===========================================
+ Hits          1611     1638      +27     
  Misses          43       43              

Impacted Files	Coverage Δ
multi_imbalance/datasets/_data_loader.py	100.00% <100.00%> (ø)
multi_imbalance/ensemble/ecoc.py	97.90% <100.00%> (+0.01%)	⬆️
multi_imbalance/ensemble/mrbbagging.py	98.49% <100.00%> (+0.02%)	⬆️
multi_imbalance/ensemble/ovo.py	96.26% <100.00%> (+0.07%)	⬆️
multi_imbalance/ensemble/tests/test_ecoc.py	96.26% <100.00%> (+0.30%)	⬆️
multi_imbalance/ensemble/tests/test_mrbbagging.py	98.38% <100.00%> (ø)
multi_imbalance/ensemble/tests/test_ovo.py	97.56% <100.00%> (+0.30%)	⬆️
multi_imbalance/resampling/static_smote.py	100.00% <100.00%> (ø)
...ti_imbalance/resampling/tests/test_static_smote.py	100.00% <100.00%> (ø)

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