Specify shared crate metadata at the workspace level #1030

Job	Run time
Test (macOS)	2m 27s
MSRV	1m 19s
Test (nightly)	3m 36s
Build docs	1m 2s
Test (stable)	3m 16s
Examples	4m 37s
Test (beta)	3m 54s
Check minimal versions	1m 2s
Test (Windows)	7m 38s
Test (native-tls)	3m 17s
Test (no default features)	1m 2s
Test (no cache)	3m 7s
Test (no gateway)	2m 7s
Test (unstable Discord API features)	3m 14s
Test (simd-json)	3m 19s
Test (chrono, chrono)	51s
Test (unstable API + typesize, default unstable_discord_api typesize, true)	1m 10s
Test (builder without model, builder, true)	33s
Test (unstable Discord API (no default features), unstable_discord_api, true)	36s
	48m 7s

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