Add via parameter on join room requests as per MSC4156 (#3441) #14

Job	Run time
Unit tests	3m 40s
Linting	4m 40s
Build for Windows (windows, amd64)	2m 17s
Build for Linux (linux, amd64)	3m 49s
Build for Linux (linux, 386)	1m 45s
WASM build test	0s
Initial tests passed	2s
Upgrade tests from HEAD-2	34s
Sytest (SQLite native)	6m 8s
Integration tests	5m 21s
Sytest (SQLite Cgo)	6m 9s
Complement (SQLite native)	4m 32s
Upgrade tests	32s
Complement (SQLite Cgo)	4m 40s
Sytest (PostgreSQL)	7m 15s
Complement (PostgreSQL)	8m 43s
Integration tests passed	1s
Update Docker images	0s
	1h 0m 8s

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