ADD: runoff sensitivities to pr and tas (WIP)

[nocollier]

Implement work by Hanjun and Flavio.

Sensitivities are defined as the coefficients from a linear regression of the anomalies of mrro ~ tas + pr on a per basin basis.

To do

• Port the methodology as an analysis type in the ilamb3 system. Numbers are approximately correct based on CanESM5/Amazon figure provided by Hanjun.
• Validate ilamb3 sensitivities with precise numbers form Hanjun.
• Add the MRB river basin regions to ILAMB-Data.
• Provide documentation for the ilamb3 readthedocs site.
• Decide on the form of the reference data. Do we store the sensitivities as a dataset or do we have the users provide reference sources for mrro, tas, and pr and compute them on the fly?
• Decide on a transformation of the sensitivities of the reference and comparison into a score as per the ilamb paradigm.
• Create tests which cover all of the new methodology.

Ideas

• Create global maps of the sensitivities extended by their corresponding basins for the reference, comparison, and then bias.
• Scoring provides an opportunity to think about how to use uncertainty from both the reference and the comparison

[codecov]

Codecov Report

Attention: Patch coverage is 0.51020% with 195 lines in your changes missing coverage. Please review.

Project coverage is 67.10%. Comparing base (273ea86) to head (eeace80).

Files with missing lines	Patch %	Lines
ilamb3/analysis/runoff_sensitivity.py	0.00%	125 Missing ⚠️
ilamb3/post.py	0.00%	63 Missing ⚠️
ilamb3/dataset.py	12.50%	7 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (273ea86) and HEAD (eeace80). Click for more details.

HEAD has 146 uploads less than BASE

Flag	BASE (273ea86)	HEAD (eeace80)
	150	4

Additional details and impacted files

@@             Coverage Diff             @@
##             main       #9       +/-   ##
===========================================
- Coverage   81.93%   67.10%   -14.84%     
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  Files          13       15        +2     
  Lines         880     1076      +196     
===========================================
+ Hits          721      722        +1     
- Misses        159      354      +195     

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