[bidi][js] Add script message event

[pujagani]

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Description

Adding https://w3c.github.io/webdriver-bidi/#event-script-message APIs to the JS Bindings

Motivation and Context

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• I have read the contributing document.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (8cebe10) 57.52% compared to head (f52aabb) 57.52%.
Report is 1 commits behind head on trunk.

❗ Current head f52aabb differs from pull request most recent head 1dcafa2. Consider uploading reports for the commit 1dcafa2 to get more accurate results

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Additional details and impacted files

@@           Coverage Diff           @@
##            trunk   #13153   +/-   ##
=======================================
  Coverage   57.52%   57.52%           
=======================================
  Files          86       86           
  Lines        5299     5299           
  Branches      221      221           
=======================================
  Hits         3048     3048           
  Misses       2030     2030           
  Partials      221      221           

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