core: Add breakoutGroup to all screenshare objects

[richtrwhereby]

Description

Add a breakoutGroup parameter to the Screenshare interface and set this property when selectScreenshares is accessed.

Related Issue:
#471 (Attach breakoutGroup to all remote and local participants on room_joined, new_client and breakout_group_joined signal events)

Checklist

• My code follows the project's coding standards.
• Prefixed the PR title and commit messages with the service or package name
• I have written unit tests (if applicable).
• I have updated the documentation (if applicable).
• By submitting this pull request, I confirm that my contribution is made
  under the terms of the MIT license.

[changeset-bot]

🦋 Changeset detected

Latest commit: 34c8ba4

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 3 packages

Name	Type
@whereby.com/core	Minor
@whereby.com/browser-sdk	Patch
@whereby.com/react-native-sdk	Patch

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