Remove Context from FullEvent #4579

Job	Run time
Build docs	33s
Examples	3m 42s
Test (macOS)	2m 52s
Check minimal versions	30s
MSRV	46s
Test (nightly)	2m 51s
Test (stable)	3m 9s
Test (beta)	2m 50s
Test (Windows)	4m 24s
Test (native-tls)	2m 58s
Test (no default features)	49s
Test (no cache)	2m 58s
Test (no gateway)	1m 53s
Test (unstable Discord API features)	3m 6s
Test (simd-json)	3m 13s
Test (chrono, chrono)	47s
Test (unstable API + typesize, default unstable_discord_api typesize, true)	1m 7s
Test (builder without model, builder, true)	33s
Test (unstable Discord API (no default features), unstable_discord_api, true)	31s
	39m 32s

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