common: Add chat message removal flows and APIs

[richtrwhereby]

Description

Add removeChatMessage API to both Core and Browser SDKs. Handle chat message removal responses from the server (i.e. mark chat messages with removed: true).

Testing

1. Run pnpm build && pnpm dev
2. When storybook starts, navigate to "Stories" > "Custom UI" > "Room connection only"
3. Join a Whereby room
4. Send a chat message in the room via the storybook UI
5. When the chat message appears, click "Remove" next to that message.
6. Verify that the message is removed from the room and the message is displayed with strikethrough formatting.
7. When storybook starts, navigate to "Stories" > "Custom UI" > "Room connection With Host Controls"
8. Join a Whereby room
9. Send a chat message in the room via the storybook UI
10. When the chat message appears, click "Remove" next to that message.
11. Join the same room with another user and send a chat message from that user.
12. When the chat message appears in the storybook UI, click "Remove" next to that message.
13. Verify that a host is able to remove any/all messages from the room and all removed messages are displayed with strikethrough formatting.

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: c6ca91d

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

This PR includes changesets to release 5 packages

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

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