Verify_groupby

[aaronspring]

Closes #635

implement for:

• HindcastEnsemble.verify()
• PerfectModelEnsemble.verify()
• bootstrap?

[codecov]

Codecov Report

Merging #690 (68d1b05) into main (c113bf1) will increase coverage by 0.07%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #690      +/-   ##
==========================================
+ Coverage   93.78%   93.85%   +0.07%     
==========================================
  Files          58       58              
  Lines        6126     6205      +79     
==========================================
+ Hits         5745     5824      +79     
  Misses        381      381              

Impacted Files	Coverage Δ
climpred/classes.py	95.00% <100.00%> (+0.34%)	⬆️
climpred/metrics.py	91.76% <100.00%> (+0.14%)	⬆️
climpred/tests/test_HindcastEnsemble_class.py	100.00% <100.00%> (ø)
climpred/tests/test_PerfectModelEnsemble_class.py	98.96% <100.00%> (+0.04%)	⬆️
climpred/tests/test_metrics.py	86.13% <100.00%> (+2.80%)	⬆️

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