Swipe right anywhere on screen to open side panel

#### Is your feature request related to a problem?

Many Android devices now use gesture navigation on the edges of the screen as a back action. This makes it difficult to access the space panel as well as breadcrumbs, which are essential interactions for navigating the app.

#### Describe the solution you'd like.

Because there aren't any conflicting right-swiping gestures in place anywhere else in the app, Element could open the side panel whenever I swipe right from anywhere on the screen, not just when I swipe right from the left edge.

#### Describe alternatives you've considered.

Alternatively, right-swiping gestures could be used for other functionality within the app, however I would argue that switching spaces and using breadcrumbs are essential enough interactions that they should be assigned this funtionality instead.