Feat/xarray ensemble scores

[Oisin-M]

Description

Works towards #94

• docstrings
• tests
• credit scores
• (nice to have) document nan behaviour

Contributor Declaration

By opening this pull request, I affirm the following:

• All authors agree to the Contributor License Agreement.
• The code follows the project's coding standards.
• I have performed self-review and added comments where needed.
• I have added or updated tests to verify that my changes are effective and functional.
• I have run all existing tests and confirmed they pass.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 97.43590% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 99.24%. Comparing base (36e7b50) to head (8135cfe).
⚠️ Report is 1 commits behind head on develop.

Files with missing lines	Patch %	Lines
tests/score/test_ensemble.py	97.43%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop      #96      +/-   ##
===========================================
+ Coverage    96.97%   99.24%   +2.26%     
===========================================
  Files           21       22       +1     
  Lines         1556     1595      +39     
  Branches        33       33              
===========================================
+ Hits          1509     1583      +74     
+ Misses          42        6      -36     
- Partials         5        6       +1     

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