feat: Add WDGRL method

[antoinedemathelin]

Add the WDGRL method with docstring and example

[codecov-commenter]

Codecov Report

Merging #12 (cecb995) into master (7e8c597) will increase coverage by 0.38%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #12      +/-   ##
==========================================
+ Coverage   90.41%   90.80%   +0.38%     
==========================================
  Files          18       19       +1     
  Lines        1649     1718      +69     
==========================================
+ Hits         1491     1560      +69     
  Misses        158      158              

Impacted Files	Coverage Δ
adapt/feature_based/__init__.py	100.00% <100.00%> (ø)
adapt/feature_based/_wdgrl.py	100.00% <100.00%> (ø)

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