Add a function for parsing a channel ID from a channel URL (#3075) #933

Job	Run time
Test (macOS)	1m 35s
Examples	3m 7s
Build docs	53s
Check minimal versions	56s
Test (nightly)	1m 52s
MSRV	0s
Test (stable)	2m 52s
Test (beta)	2m 57s
Test (Windows)	7m 31s
Test (native-tls)	2m 56s
Test (no default features)	1m 0s
Test (no cache)	2m 22s
Test (no gateway)	1m 56s
Test (unstable Discord API features)	2m 36s
Test (zlib compression)	2m 30s
Test (zstd compression)	2m 46s
Test (zlib and zstd compression)	2m 40s
Test (chrono, chrono)	1m 7s
Test (unstable API + typesize, default unstable typesize, true)	1m 0s
Test (builder without model, builder, true)	52s
Test (unstable Discord API (no default features), unstable, true)	49s
	44m 17s

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