[Feature Request] Add a "Scroll to Top" button in EmbeddedChat

[thesynthax]

As an EmbeddedChat/Rocket.Chat developer and user

I need to: Go to the first message at times

So That: I can check the start of the conversation in a room/channel.

Acceptance Criteria

• [ ] Add a "Scroll to Top" button to go to the first message as shown in the image below

I am willing to submit a PR for this feature request.

[KhalanderCSE734]

I want to work on this issue. Can you please assign me this issue.