fix(plugin-meetings): add waitingForOthersToJoin to in-meeting action

[rajeshtezu]

COMPLETES #<SPARK-359114>

This pull request addresses

Adds a property waitingForOthersToJoin to check if others has joined or not and could be utilised to show actual remote video, hide it or show a custom banner.

by making the following changes

< DESCRIBE YOUR CHANGES >

Change Type

• 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)
• Documentation update
• Tooling change
• Internal code refactor

The following scenarios where tested

< ENUMERATE TESTS PERFORMED, WHETHER MANUAL OR AUTOMATED >

I certified that

• I have read and followed contributing guidelines

• I discussed changes with code owners prior to submitting this pull request

• I have not skipped any automated checks

• All existing and new tests passed

• I have updated the documentation accordingly

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Make sure to have followed the contributing guidelines before submitting.

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[arun3528]

Code looks good we will need some tests and a wiki with basic info

[rajeshtezu]

Code looks good we will need some tests and a wiki with basic info

Added unit tests and Wiki