Room list contextual menu (#427)

- Adds `ModalBottomSheet` to our design components (it wraps the homonimous Material3 one).
- Adds  a bottom sheet to the Room list using the aforementioned design component.
- Adds navigation from the room list to a room detail (context menu "Settings" action).
- Consolidates the "leave room flow" into a new `leaveroom` module used by both the room list and the room details.
  - Adds progress indicator to the leave room flow
- Uses new `leaveroom` module in `roomdetails` module too. 

Parent issue:
- https://github.com/vector-im/element-x-android/issues/261

samples/minimal/build.gradle.kts

@@ -57,6 +57,7 @@ dependencies {
     implementation(projects.libraries.dateformatter.impl)
     implementation(projects.features.invitelist.impl)
     implementation(projects.features.roomlist.impl)
+    implementation(projects.features.leaveroom.impl)
     implementation(projects.features.login.impl)
     implementation(projects.features.networkmonitor.impl)
     implementation(libs.coroutines.core)