Deprecate Channel::is_nsfw (#2791) #872

Job	Run time
Examples	4m 7s
Build docs	50s
Test (macOS)	3m 24s
Check minimal versions	1m 1s
MSRV	57s
Test (nightly)	3m 32s
Test (stable)	3m 4s
Test (beta)	3m 19s
Test (Windows)	8m 37s
Test (native-tls)	2m 52s
Test (no default features)	40s
Test (no cache)	2m 55s
Test (no gateway)	2m 4s
Test (unstable Discord API features)	3m 27s
Test (simd-json)	3m 12s
Test (chrono, chrono)	46s
Test (unstable API + typesize, default unstable_discord_api typesize, true)	59s
Test (builder without model, builder, true)	52s
Test (unstable Discord API (no default features), unstable_discord_api, true)	25s
	47m 3s

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