Remove `PartialEq` implementations from all builders #843

# to view logs

Job	Run time
Examples	3m 23s
Build docs	49s
Test (macOS)	4m 39s
Check minimal versions	53s
Test (nightly)	3m 4s
Test (stable)	3m 17s
MSRV	0s
Test (beta)	2m 46s
Test (Windows)	6m 8s
Test (native-tls)	2m 55s
Test (no default features)	50s
Test (no cache)	2m 45s
Test (no gateway)	1m 55s
Test (unstable Discord API features)	3m 6s
Test (simd-json)	3m 3s
Test (chrono, chrono)	55s
Test (unstable API + typesize, default unstable_discord_api typesize, true)	1m 6s
Test (builder without model, builder, true)	40s
Test (unstable Discord API (no default features), unstable_discord_api, true)	41s
	42m 55s

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