feat(meetings): add meeting join time marker

[chrisadubois]

This pull request addresses

Adding a private readonly variable (once set) meeting join time marker

by making the following changes

Adding a private readonly variable (once set) meeting join time marker

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 were tested

Both manual and automated. future web client PR to come

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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