feature(room preview): Add option to forget room, improve the room preview screen for banned rooms.

Some internal refactoring was done too:
- Remove RoomInfo.isPublic to only use JoinRule.
- Also take into account restricted access rooms for previews.

libraries/ui-strings/src/main/res/values/localazy.xml

@@ -271,6 +271,7 @@ Reason: %1$s."</string>
   <string name="common_verified">"Verified"</string>
   <string name="common_verify_device">"Verify device"</string>
   <string name="common_verify_identity">"Verify identity"</string>
+  <string name="common_verify_user">"Verify user"</string>
   <string name="common_video">"Video"</string>
   <string name="common_voice_message">"Voice message"</string>
   <string name="common_waiting">"Waiting…"</string>
@@ -297,6 +298,7 @@ Reason: %1$s."</string>
   <string name="error_missing_location_auth_android">"%1$s does not have permission to access your location. You can enable access in Settings."</string>
   <string name="error_missing_location_rationale_android">"%1$s does not have permission to access your location. Enable access below."</string>
   <string name="error_missing_microphone_voice_rationale_android">"%1$s does not have permission to access your microphone. Enable access to record a voice message."</string>
+  <string name="error_network_or_server_issue">"This may be due to network or server issues."</string>
   <string name="error_room_address_already_exists">"This room address already exists. Please try editing the room address field or change the room name"</string>
   <string name="error_room_address_invalid_symbols">"Some characters are not allowed. Only letters, digits and the following symbols are supported ! $ &amp; ‘ ( ) * + / ; = ? @ [ ] - . _"</string>
   <string name="error_some_messages_have_not_been_sent">"Some messages have not been sent"</string>