feat: implement Redis-based message bus and awareness management

- Added RedisMessageBus for message distribution using Redis Pub/Sub.
- Introduced LocalMessageBus as a no-op implementation for single-server mode.
- Created messagebus interface for abstraction of message distribution.
- Implemented awareness management methods: SetAwareness, GetAllAwareness, DeleteAwareness, and ClearAllAwareness.
- Added logger utility for structured logging with zap.
- Refactored SniffYjsClientIDs and MakeYjsDeleteMessage functions for improved readability.

backend/go.sum

@@ -1,15 +1,22 @@
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@@ -68,6 +75,8 @@ github.com/quic-go/qpack v0.5.1 h1:giqksBPnT/HDtZ6VhtFKgoLOWmlyo9Ei6u9PqzIMbhI=
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@@ -83,8 +92,14 @@ github.com/twitchyliquid64/golang-asm v0.15.1 h1:SU5vSMR7hnwNxj24w34ZyCi/FmDZTkS
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