feat: send targeted meeting notification in Teams meetings

[singhk97]

Description

This feature aims to extend the JS Bot SDK so that developers can send targeted meeting notifications in Microsoft Teams meetings.

Closes #4384

Specific Changes

Ran yarn build:rollup on both the botbuilder, botframework-connector & botframework-schema libraries to generate public api doc.

botbuilder

• Added sendMeetingNotification method to TeamsInfo class.

botframework-schema

• Added multiple interfaces to the index.ts monolith of interfaces & types related to Teams meeting notifications. TeamsMeetingNotification interface defines the notification payload to the API call. All other interfaces are used to build this interface.

botframework-connector

• Added a type to teams related model.
• Added multiple ms-rest objects used in the ms-rest set up for the REST API call.
• Implemented sendMeetingNotification REST API call using the existing ms-rest template.

Testing

• Unit tests only done for changes in teamsInfo.ts from the botbuilder library.
• botframework-schema changes are adding new types & interfaces so it doesn't make sense to have a unit test.
• botframework-connector unit tests are done indirectly through testing teamsInfo.ts method. This follows existing precedent of a PR with a similar feature addition: port: add support for Teams get meeting participant API #2884

[coveralls]

Pull Request Test Coverage Report for Build 3651865500

• 27 of 27 (100.0%) changed or added relevant lines in 4 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.01%) to 84.646%

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Totals
Change from base Build 3587703730:	0.01%
Covered Lines:	19995
Relevant Lines:	22384

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💛 - Coveralls