DM Details View (#744)

* Basic implementation completed but it requires some bug fixing and polishing (+4 squashed commits)
Squashed commits:
[43f0064e] now the content of the room details reflects the expected dm details content when the conditions are met
[fe6f2b5e] replaced existing headers with a composable and reusable HeaderView
[3c00120a] now the members are fetched every time the room is opened
[421d539b] refactored the members fetching to be immediate in case the room could be a direct chat

* polished the code and fixed some bugs that prevented the updated state of the members to be displayed in the room details view (+1 squashed commit)
Squashed commits:
[6bf98473] fix for the button not being destructive in room details screen

* removed copy button and updated copy

* moved a file and renamed header view

* addressed all PR comments

* sdk bump

* UI tests

* unit tests

* changelog

* updated mocks

* removed a duplicated signature in a mock

ElementX/Sources/UITests/UITestsScreenIdentifier.swift

@@ -42,6 +42,7 @@ enum UITestsScreenIdentifier: String {
     case userSessionScreen
     case roomDetailsScreen
     case roomDetailsScreenWithRoomAvatar
+    case roomDetailsScreenDmDetails
     case roomMembersListScreen
     case roomMemberDetailsAccountOwner
     case roomMemberDetails