Store player state as room metadata

[joaobologna]

The player state in a game room is not managed by Maestro. This is an experimental MR to store the player count in the room metadata, that way Maestro will be the owner of connected players in a room.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 76.19048% with 5 lines in your changes are missing coverage. Please review.

Project coverage is 81.49%. Comparing base (b3fc9e1) to head (8a5db9a).
Report is 2 commits behind head on main.

Files	Patch %	Lines
...l/core/services/events/events_forwarder_service.go	76.19%	3 Missing and 2 partials ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #615      +/-   ##
==========================================
- Coverage   81.51%   81.49%   -0.02%     
==========================================
  Files          85       85              
  Lines        5789     5810      +21     
==========================================
+ Hits         4719     4735      +16     
- Misses        877      880       +3     
- Partials      193      195       +2     

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