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/Resources/Localizations/en.lproj/Localizable.stringsdict

@@ -34,5 +34,21 @@
 			<string>%1$d room changes</string>
 		</dict>
 	</dict>
+	<key>screen_room_member_list_header_title</key>
+	<dict>
+		<key>NSStringLocalizedFormatKey</key>
+		<string>%#@COUNT@</string>
+		<key>COUNT</key>
+		<dict>
+			<key>NSStringFormatSpecTypeKey</key>
+			<string>NSStringPluralRuleType</string>
+			<key>NSStringFormatValueTypeKey</key>
+			<string>d</string>
+			<key>one</key>
+			<string>1 person</string>
+			<key>other</key>
+			<string>%1$d people</string>
+		</dict>
+	</dict>
 </dict>
 </plist>