Temporary "Join Support Room" btn

### Your use case

#### What would you like to do?

Put a "Join Support Room" in an appropriate location, when activated the app will Join your user or alternatively send an invite.

Temporary until Room joining is a thing.

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

Despite there being a support room dedicated to Element X, there are no flows to Join rooms in Element X at the moment.

You need aided by a desktop client and not everyone owns multiple devices.

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

Put in settings "chat with support" and then use an automated matrix api call relevant to Join requests.

### Have you considered any alternatives?

_No response_

### Additional context

_No response_

### Are you willing to provide a PR?

No