Provide a separate MessageList that's optimized for the Livestream use cases

[filbabic]

Context & proposal

Our current message list is mostly optimized for the Social Chat experience but we want to support the Livestream examples better. In order to have a clean distinction and an optimized list that works with a large influx of messages, has fewer overhead features and is focused on one thing, we should try to provide a fully set up and optimized list.

Acceptance criteria

To accept this task we need to complete the following items:

• [ ] Provide a custom message list that features livestream optimizations, in Compose and XML.
• [ ] Write guides on how to use it in a livestream example.
• [ ] Showcase the optimizations/improvements in the implementation.

[filbabic]

Closing this one as we'll most likely cover it with an OP/Core change.