Add rustplus_bridge cog with FCM push notifications for Discord-Rust+ chat bridge

[Copilot]

Implements bidirectional chat bridge between Discord channels and Rust+ in-game team chat. Supports both polling and Firebase Cloud Messaging modes to eliminate constant API polling.

Implementation

Core Bridge

• Bidirectional message forwarding with automatic reconnection (exponential backoff, 60s max)
• Memory-bounded message deduplication (cleanup at 1000 entries → 500 retained)
• Discord messages prefixed with username, Rust messages rendered as embeds with Steam ID

Dual Operation Modes

• Polling mode (default): Configurable 1-60s interval, no additional credentials required
• FCM mode (optional): Real-time push notifications via Firebase Cloud Messaging, eliminates polling overhead

Configuration Commands

[p]rustbridge setup <ip> <port> <player_id> <player_token>  # Basic credentials
[p]rustbridge fcm <json_credentials>                         # Optional FCM setup
[p]rustbridge pollinterval <seconds>                         # Adjust polling (non-FCM)
[p]rustbridge status                                         # Shows connection/FCM state

Technical Details

• Async throughout, daemon-threaded FCM listeners with proper cleanup
• Config-persisted credentials, runtime connection/task state management
• Graceful degradation: FCM failures auto-fallback to polling
• Closure capture for guild_id in FCM event handlers prevents reference issues

Dependencies: rustplus>=6.0.0

File Structure:

• rustplus_bridge/rustplus_bridge.py - Main cog (750 LOC)
• rustplus_bridge/README.md - Setup, troubleshooting, technical docs
• .github/copilot-instructions.md - Updated with cog details

Original prompt

Create a new cog for rustplus.
This cog should support connecting to a server, and listening for team chat messages and creating a bridge between discord, so that messages in game are sent to discord, and messages in discord and sent ingame.

Note that there should be a method in discord for a user to submit their rustplus credentials so that the cog can correctly subscribe.

Context on rustplus - https://github.com/olijeffers0n/rustplus

A similar bot https://github.com/alexemanuelol/rustplusplus though this is made with javascript and i need it made in python.

Make sure to handle the connection and any memory leaks

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