Add a function for parsing a channel ID from a channel URL (#3075) #1036

Job	Run time
Build docs	41s
Examples	2m 41s
Test (macOS)	1m 37s
Check minimal versions	31s
MSRV	0s
Test (nightly)	1m 40s
Test (stable)	2m 45s
Test (beta)	3m 5s
Test (Windows)	4m 23s
Test (native-tls)	2m 34s
Test (no default features)	55s
Test (no cache)	2m 27s
Test (no gateway)	1m 40s
Test (unstable Discord API features)	2m 36s
Test (zlib compression)	2m 25s
Test (zstd compression)	2m 24s
Test (zlib and zstd compression)	2m 37s
Test (chrono, chrono)	52s
Test (unstable API + typesize, default unstable typesize, true)	1m 5s
Test (builder without model, builder, true)	35s
Test (unstable Discord API (no default features), unstable, true)	36s
	38m 9s

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