add support for multiclass local importance values for text

[imatiach-msft]

Description

Added support for multiclass local importance value for RAI text scenario.

• Updated test data to include more samples for test app, and now updated to include multiclass values
• Refactored TextExplanationDashboard into a separate TextExplanationView class which has the weight vector set
• Refactored out the class importance picker used in tabular explanation view into its own ClassImportanceWeights component
• Updated python backend in responsibleai package to support the new importance values

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 #1601 (530e504) into main (93eca66) will increase coverage by 1.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1601      +/-   ##
==========================================
+ Coverage   88.96%   90.00%   +1.03%     
==========================================
  Files         109       38      -71     
  Lines        5381     1640    -3741     
==========================================
- Hits         4787     1476    -3311     
+ Misses        594      164     -430     

Flag	Coverage Δ
unittests	90.00% <ø> (+1.03%)	⬆️

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

Impacted Files	Coverage Δ
responsibleai/responsibleai/_interfaces.py
...ponsibleai/responsibleai/_managers/base_manager.py
responsibleai/responsibleai/__init__.py
...ponsibleai/responsibleai/_tools/shared/__init__.py
...ai/databalanceanalysis/feature_balance_measures.py
...sponsibleai/responsibleai/rai_insights/__init__.py
...ponsibleai/databalanceanalysis/balance_measures.py
raiwidgets/raiwidgets/error_handling.py
...ponsibleai/responsibleai/rai_insights/constants.py
...nsibleai/databalanceanalysis/data_balance_utils.py
... and 61 more

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[github-actions]

https://responsibleai.blob.core.windows.net/pullrequest/microsoft/responsible-ai-toolbox/ilmat/text-importances-backend/dashboard/index.html