add support for edit_current_application endpoint #5761

Job	Run time
Test (macOS)	1m 10s
Check minimal versions	27s
Test (nightly)	1m 28s
Test (stable)	2m 25s
Test (beta)	2m 10s
Test (Windows)	4m 10s
Test (native-tls)	2m 14s
Test (no default features)	43s
Test (no cache)	2m 22s
Build docs	31s
Test (no gateway)	1m 47s
Test (unstable Discord API features)	2m 22s
Examples	2m 22s
Test (chrono, chrono)	38s
MSRV	0s
Test (unstable API + typesize, default unstable typesize, true)	46s
Test (builder without model, builder, true)	17s
Test (unstable Discord API (no default features), unstable, true)	36s
	26m 28s

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