Milestone-D5: collaboration service

What's Changed

• Create collaboration service skeleton by @tsulim in #57
• Integrate collaboration service with matching service by @tsulim in #60
• Update docker-compose by @tsulim in #68
• Add CodeEditor to Collaboration Page by @xuelinglow in #73
• Store collaboration session data to database with interval backup by @whitesnowx in #75
• Make category field array - match with one of the categories by @xuelinglow in #74
• Deleting socket session data: use id instead of roomId by @whitesnowx in #78
• Fix display of different question in same collaboration by @tsulim in #77
• Merge main with collaboration service branch + conflict revolve by @whitesnowx in #80

Full Changelog: Milestone-D4...Milestone-D5