fix(plugin-meetings): add alias in joinMeeting request body: SPARK-514797

[stanjiawang]

COMPLETES #< INSERT LINK TO ISSUE >

https://jira-eng-gpk2.cisco.com/jira/browse/SPARK-514797

This pull request addresses

< DESCRIBE THE CONTEXT OF THE ISSUE >

For third party integration join, we need pass userDisplayName as alias in joinMeeting request body.

https://confluence-eng-gpk2.cisco.com/conf/pages/viewpage.action?spaceKey=WMT&title=Third-Party+Integration+Join+Flow+Support+In+UCF

by making the following changes

< DESCRIBE YOUR CHANGES > Add alias in joinMeeting request body

Change Type

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] 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

• [x] I have read and followed contributing guidelines

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

• [x] I have not skipped any automated checks

• [x] All existing and new tests passed

• [x] I have updated the documentation accordingly

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Make sure to have followed the contributing guidelines before submitting.

[stanjiawang]

@robstax Unit tests added to packages/@webex/plugin-meetings/test/unit/spec/meeting/request.js

[stanjiawang]

@sreenara Thanks for your comments! I have updated the description based on your comments.