Add a function for parsing a channel ID from a channel URL (#3075) #1037

Job	Run time
Build docs	51s
Examples	2m 49s
Test (macOS)	1m 52s
Check minimal versions	56s
MSRV	0s
Test (nightly)	1m 59s
Test (stable)	2m 35s
Test (beta)	2m 33s
Test (Windows)	5m 35s
Test (native-tls)	2m 25s
Test (no default features)	56s
Test (no cache)	2m 30s
Test (no gateway)	1m 53s
Test (unstable Discord API features)	2m 37s
Test (zlib compression)	2m 30s
Test (zstd compression)	2m 34s
Test (zlib and zstd compression)	2m 39s
Test (chrono, chrono)	59s
Test (unstable API + typesize, default unstable typesize, true)	1m 23s
Test (builder without model, builder, true)	43s
Test (unstable Discord API (no default features), unstable, true)	46s
	41m 5s

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