Add soundboard events #6390

Job	Run time
Test (nightly)	1m 36s
Build docs	28s
Examples	3m 8s
Test (macOS)	1m 28s
Check minimal versions	32s
MSRV	56s
Test (no cache)	1m 39s
Test (beta)	1m 36s
Test (no default features)	40s
Test (native-tls)	1m 34s
Test (Windows)	5m 37s
Test (stable)	1m 51s
Test (no gateway)	1m 26s
Test (chrono, chrono)	41s
Test (simd-json)	2m 6s
Test (unstable Discord API features)	1m 54s
Test (unstable Discord API (no default features), unstable_discord_api, true)	39s
Test (builder without model, builder, true)	18s
Test (unstable API + typesize, default unstable_discord_api typesize, true)	58s
	29m 7s

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