Implement `PartialEq` and `Eq` for `ActivityData` (#3094) #942

Job	Run time
Build docs	21s
Examples	3m 7s
Test (macOS)	1m 53s
Check minimal versions	36s
MSRV	31s
Test (nightly)	2m 55s
Test (stable)	3m 17s
Test (beta)	2m 58s
Test (Windows)	4m 58s
Test (native-tls)	3m 1s
Test (no default features)	41s
Test (no cache)	3m 6s
Test (no gateway)	1m 56s
Test (unstable Discord API features)	3m 18s
Test (simd-json)	3m 13s
Test (chrono, chrono)	42s
Test (unstable API + typesize, default unstable_discord_api typesize, true)	1m 4s
Test (builder without model, builder, true)	23s
Test (unstable Discord API (no default features), unstable_discord_api, true)	23s
	38m 23s

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