Specify shared crate metadata at the workspace level #5866

Job	Run time
Build docs	54s
Test (macOS)	1m 41s
Examples	4m 11s
Check minimal versions	55s
MSRV	1m 6s
Test (nightly)	3m 39s
Test (stable)	3m 18s
Test (beta)	3m 31s
Test (Windows)	5m 44s
Test (native-tls)	2m 56s
Test (no default features)	45s
Test (no cache)	2m 55s
Test (no gateway)	1m 52s
Test (unstable Discord API features)	3m 26s
Test (simd-json)	3m 22s
Test (chrono, chrono)	45s
Test (unstable API + typesize, default unstable_discord_api typesize, true)	1m 27s
Test (builder without model, builder, true)	27s
Test (unstable Discord API (no default features), unstable_discord_api, true)	39s
	43m 33s

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