feat: Handle room metadata updates from the room_metadata component

[bgrozev]

• ref: Remove unused class.
• feat: Handle updates from the room_metadata component.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 55 lines in your changes are missing coverage. Please review.

Project coverage is 29.03%. Comparing base (49cc46e) to head (365fe7d).

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1139      +/-   ##
============================================
- Coverage     29.14%   29.03%   -0.12%     
  Complexity      478      478              
============================================
  Files           130      130              
  Lines          7863     7893      +30     
  Branches       1081     1085       +4     
============================================
  Hits           2292     2292              
- Misses         5299     5329      +30     
  Partials        272      272              

Files	Coverage Δ
.../main/kotlin/org/jitsi/jicofo/xmpp/muc/ChatRoom.kt	0.00% <ø> (ø)
.../main/kotlin/org/jitsi/jicofo/xmpp/XmppServices.kt	0.00% <0.00%> (ø)
...n/kotlin/org/jitsi/jicofo/xmpp/muc/ChatRoomImpl.kt	0.00% <0.00%> (ø)
...otlin/org/jitsi/jicofo/xmpp/RoomMetadataHandler.kt	0.00% <0.00%> (ø)

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