Add a banner to encrypted rooms with visible history. (#4738)

* feat: Add history visible alert.

- Adds a dismissable alert that is displayed whenever the user
  opens a room with `history_visibility` != `joined`. When cleared,
  this is recorded in the app's data store.
- When opening a room with `history_visibility` = `joined`, this
  flag is cleared.

Issue: element-hq/element-meta#2875

* tests: Add unit tests for history sharing in `RoomScreenFooterView`.

* feat: Rename flag to `hasSeenHistoryVisibleBannerRooms`, document.

* refactor: Merge enum variants, use function for banner description.

* feat: Use `AppSettings.historyVisibleDetailsURL` over hard-coded value.

* tests: Correct potential race condition with deferred assertion.

* chore: Use Localazy translation string over project-defined.

* fix: Final tweaks and review comments.

* chore: Checkout `Enterprise` submodule.

* tests: Final fixes.

ElementX/Sources/Screens/RoomScreen/RoomScreenModels.swift

@@ -93,11 +93,13 @@ struct RoomScreenViewStateBindings {
 enum RoomScreenFooterViewAction {
     case resolvePinViolation(userID: String)
     case resolveVerificationViolation(userID: String)
+    case dismissHistoryVisibleAlert
 }
 
 enum RoomScreenFooterViewDetails {
     case pinViolation(member: RoomMemberProxyProtocol, learnMoreURL: URL)
     case verificationViolation(member: RoomMemberProxyProtocol, learnMoreURL: URL)
+    case historyVisible(learnMoreURL: URL)
 }
 
 enum PinnedEventsBannerState: Equatable {