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: https://github.com/whereby/sdk/pull/471 (Attach breakoutGroup to all remote and local participants on room_joined, new_client and breakout_group_joined signal events)

Checklist

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

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 34c8ba4e7fd142e6b903cd9833b573c93d4fb819

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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