Follow discussion continued in other room

### Your use case

#### What would you like to do?

Follow room link/pill to continue reading the conversation in the other room at that point in time.

#### Why would you like to do it?

Often times, people point others to the more appropriate/relevant room to chat in instead. But it makes the conversation hard to follow if you want to see where the discussion continued in the other room.

Example:


#### How would you like to achieve it?

Potential solutions although I'm not really fond on any of these:

1. Right-click context menu option on room pills: `Follow conversation to other room`
1. A little icon in the room pill that somehow conveys the same thing. Clicking the icon instead of pill itself will jump to that point in time when the message was sent. Similar to the external link icon but with a little jump backwards in time clock arrow icon:

backwards-in-time-clock-arrow.svg

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### Have you considered any alternatives?

With [MSC3030](https://github.com/matrix-org/matrix-doc/pull/3030) and the `/jumptodate` slash command, you can manually use the room link and the `/jumptodate 2022-01-01` to the date the people were chatting at before. Just more manual steps but it's suitable.

### Additional context

- Follow conversation
- Jump into room where the conversation moved to
- Open room pills when message was sent
- Discussion continued in other room