Add Consume Entitlement endpoint and missing fields for SKUs and Enti… #978

Job	Run time
Test (macOS)	1m 26s
Test (stable)	3m 6s
Test (beta)	3m 1s
Test (Windows)	5m 25s
Examples	4m 2s
Build docs	42s
Test (native-tls)	2m 49s
Test (no default features)	52s
Test (no cache)	2m 50s
MSRV	0s
Check minimal versions	39s
Test (no gateway)	1m 44s
Test (unstable Discord API features)	3m 15s
Test (nightly)	3m 19s
Test (simd-json)	3m 9s
Test (chrono, chrono)	51s
Test (unstable API + typesize, default unstable_discord_api typesize, true)	1m 11s
Test (builder without model, builder, true)	34s
Test (unstable Discord API (no default features), unstable_discord_api, true)	25s
	39m 20s

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