Add backend functions in causal_manager.py to handle dashboard requests

[gaugup]

Description

This PR adds request_global_cohort_effects, request_local_instance_effects and request_global_cohort_policy to causal_manager.py. These functions are added so that the python backend (responsibleai) can request global cohort level stats for causal effects and causal policy.

The related PR is #1552, which requires additional work to add the cohort level filtering to RAIdashboard endpoints.

Checklist

• I have added screenshots above for all UI changes.
• I have added e2e tests for all UI changes.
• Documentation was updated if it was needed.

[codecov-commenter]

Codecov Report

Merging #1579 (4aea12e) into main (f8312f6) will increase coverage by 0.07%.
The diff coverage is 96.22%.

@@            Coverage Diff             @@
##             main    #1579      +/-   ##
==========================================
+ Coverage   88.87%   88.95%   +0.07%     
==========================================
  Files         109      109              
  Lines        5332     5379      +47     
==========================================
+ Hits         4739     4785      +46     
- Misses        593      594       +1     

Flag	Coverage Δ
unittests	88.95% <96.22%> (+0.07%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...onsibleai/responsibleai/managers/causal_manager.py	95.36% <95.65%> (-0.06%)	⬇️
...bleai/responsibleai/_tools/causal/causal_result.py	97.05% <96.66%> (+0.72%)	⬆️

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[github-actions]

https://responsibleai.blob.core.windows.net/pullrequest/microsoft/responsible-ai-toolbox/gaugup/CausalBackendRequestFunctions/dashboard/index.html

[github-actions]

https://responsibleai.blob.core.windows.net/pullrequest/microsoft/responsible-ai-toolbox/gaugup/CausalBackendRequestFunctions/dashboard/index.html

[github-actions]

https://responsibleai.blob.core.windows.net/pullrequest/microsoft/responsible-ai-toolbox/gaugup/CausalBackendRequestFunctions/dashboard/index.html