Ability to view more than just the 100 most recent room pins.

### Your use case

#### What would you like to do?
Be able to access all room pins.
#### Why would you like to do it?
With #28041 resolved, it's only possible to view the last 100 message pins, which is a welcome change for the room pin banner that can't be disabled separately from pin support, but breaks workflows that rely on being able to access less recent room pins when there are more than 100 of them at a time.
#### How would you like to achieve it?
It would be nice to have the room pin list on the side be able to access all pinned messages, while the top bar only shows the most recent 100.

### Have you considered any alternatives?

Alternatively it may make sense to set individual configurations for:
- Whether the pinned message bar shows up at all.
- Whether the pinned message bar shows more than the 100 most recently pinned messages.
- Whether the pinned message list shows more than the 100 most recently pinned messages.

With more effort it may be worth considering to make both the pinned messages bar and list load messages on demand, similar to how the regular message timeline works, as opposed to getting all/ a fixed amount of messages at once.

### Additional context

_No response_