Implement Knock Logic (#3573)

* WIP RequestToJoin struct

* implemented the logic to display the cells

* knock request banner accept flow

* mark all knocks as seen implemented

* details logic

* implemented accept, decline and ban in the list

* added a loader and modified the stacked view

of the banner

* pr suggestions

* updated naming and loading strings

* added the initial loading state

improved code and the tests

* updated a string that has changed

* code improvement

* tests for the room screen view model

* room details tests

and improved the knock requests tests for the room screen

* knock requests list tests

* added error state alerts with retry

* struct has been renamed on the sdk

so I renamed it also on the app side

* update SDK

ElementX/Sources/Screens/RoomDetailsScreen/RoomDetailsScreenViewModel.swift

@@ -187,6 +187,18 @@ class RoomDetailsScreenViewModel: RoomDetailsScreenViewModelType, RoomDetailsScr
                 Task { await self?.updatePowerLevelPermissions() }
             }
             .store(in: &cancellables)
+        
+        roomProxy.knockRequestsStatePublisher
+            .map { requestsState in
+                guard case let .loaded(requests) = requestsState else {
+                    return 0
+                }
+                return requests.count
+            }
+            .removeDuplicates()
+            .throttle(for: .milliseconds(100), scheduler: DispatchQueue.main, latest: true)
+            .weakAssign(to: \.state.knockRequestsCount, on: self)
+            .store(in: &cancellables)
     }
     
     private func updateRoomInfo(_ roomInfo: RoomInfoProxy) {