JSON serialize the endpoint output and add tests

[gaugup]

Description

It seems like the end point output should be serializable by JSON. This PR does the object serialization via serialize_json_safe and adds a test to make sure that the end point output is JSON serialized.

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 #1679 (3aa6975) into main (10963da) will increase coverage by 3.54%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1679      +/-   ##
==========================================
+ Coverage   85.37%   88.91%   +3.54%     
==========================================
  Files          58      105      +47     
  Lines        3036     5559    +2523     
==========================================
+ Hits         2592     4943    +2351     
- Misses        444      616     +172     

Flag	Coverage Δ
unittests	88.91% <ø> (+3.54%)	⬆️

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

Impacted Files	Coverage Δ
raiwidgets/raiwidgets/responsibleai_dashboard.py	62.50% <ø> (ø)
...leai/responsibleai/modelanalysis/model_analysis.py	94.33% <0.00%> (ø)
...sibleai/responsibleai/rai_insights/rai_insights.py	76.72% <0.00%> (ø)
responsibleai/responsibleai/exceptions.py	100.00% <0.00%> (ø)
...sibleai/responsibleai/_tools/shared/base_result.py	95.65% <0.00%> (ø)
.../responsibleai/modelanalysis/constants/__init__.py	100.00% <0.00%> (ø)
...ponsibleai/responsibleai/_tools/causal/__init__.py	100.00% <0.00%> (ø)
...ibleai/_tools/causal/dashboard_schemas/__init__.py	100.00% <0.00%> (ø)
...ibleai/_tools/shared/state_directory_management.py	100.00% <0.00%> (ø)
...ai/responsibleai/_tools/causal/causal_constants.py	100.00% <0.00%> (ø)
... and 38 more

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[github-actions]

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

[imatiach-msft]

approved but can you change code owners so I'm not mandatory?

[github-actions]

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