Add soundboard events #6389

Job	Run time
Test (nightly)	2m 4s
Test (macOS)	2m 9s
Check minimal versions	54s
Test (beta)	2m 9s
Examples	4m 26s
MSRV	1m 0s
Test (native-tls)	1m 55s
Test (no gateway)	1m 43s
Test (stable)	1m 58s
Test (Windows)	5m 46s
Test (simd-json)	2m 15s
Test (no cache)	1m 52s
Test (unstable Discord API features)	2m 4s
Test (no default features)	53s
Test (chrono, chrono)	54s
Test (builder without model, builder, true)	45s
Test (unstable API + typesize, default unstable_discord_api typesize, true)	1m 28s
Build docs	58s
Test (unstable Discord API (no default features), unstable_discord_api, true)	49s
	36m 2s

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