Replace built-in messenger system with chat-system crate #378

Job	Run time
Security Audit	2m 47s
Unit Tests	2m 30s
Lint	37s
Check (x86_64-pc-windows-msvc, no-default)	11m 55s
Check (aarch64-unknown-linux-gnu, no-default)	3m 51s
Check (x86_64-apple-darwin, default)	2m 40s
Check (aarch64-unknown-linux-gnu, web-tools)	3m 51s
Check (x86_64-pc-windows-msvc, default)	10m 55s
Check (x86_64-unknown-linux-gnu, default)	3m 54s
Check (x86_64-unknown-linux-gnu, full)	4m 50s
Check (aarch64-apple-darwin, default)	3m 23s
Check (armv7-unknown-linux-gnueabihf, no-default)	3m 42s
Check (x86_64-unknown-linux-gnu, no-default)	3m 46s
E2E Tests	4m 41s
Integration Tests	1m 50s
Build (${{ matrix.target }})	-1s
	1h 5m 11s

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