der: add `ApplicationExplicit`, `ContextSpecificExplicit`, `PrivateExplicit` #2942

Job	Run time
test (1.85.0)	53s
test (stable)	48s
build (stable, wasm32-unknown-unknown)	33s
build (stable, thumbv7em-none-eabi)	38s
build (1.85.0, thumbv7em-none-eabi)	36s
build (1.85.0, wasm32-unknown-unknown)	36s
minimal-versions	-1s
	4m 3s

Navigation Menu