Add Consume Entitlement endpoint and missing fields for SKUs and Enti… #6400

Job	Run time
Test (nightly)	33s
Build docs	30s
MSRV	58s
Test (macOS)	1m 42s
Check minimal versions	42s
Test (beta)	2m 11s
Examples	3m 54s
Test (Windows)	5m 44s
Test (stable)	1m 53s
Test (unstable Discord API features)	1m 57s
Test (no cache)	1m 43s
Test (chrono, chrono)	45s
Test (simd-json)	1m 54s
Test (unstable API + typesize, default unstable_discord_api typesize, true)	1m 7s
Test (unstable Discord API (no default features), unstable_discord_api, true)	49s
Test (no gateway)	1m 17s
Test (no default features)	45s
Test (native-tls)	1m 47s
Test (builder without model, builder, true)	32s
	30m 43s

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