Provide `Arc<Data>` instead of `&Data` (#2722) #875

Job	Run time
Build docs	31s
Test (macOS)	2m 46s
Examples	2m 47s
MSRV	0s
Check minimal versions	45s
Test (nightly)	2m 56s
Test (stable)	3m 17s
Test (beta)	2m 41s
Test (Windows)	5m 7s
Test (native-tls)	2m 56s
Test (no default features)	40s
Test (no cache)	3m 19s
Test (no gateway)	1m 53s
Test (unstable Discord API features)	2m 56s
Test (simd-json)	3m 4s
Test (chrono, chrono)	47s
Test (unstable API + typesize, default unstable_discord_api typesize, true)	1m 0s
Test (builder without model, builder, true)	26s
Test (unstable Discord API (no default features), unstable_discord_api, true)	19s
	38m 10s

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