This adds a button to room settings page that, when clicked, provides users with a view of all of the room's state events.

Type: add

• Go to room settings page.
• Click on "Explore full room state" button.
• Verify you see a page with buttons of different state types.
• Click on a state type.
• Verify you see a list of events with that type.
• Verify you can see the sources of each event by invoking the context menu and clicking on "View source."