feat(srp): add HomeKit-compatible padding options for u and M1/M2 (#272) #277

Job	Run time
test (stable)	2m 5s
build (stable, wasm32-unknown-unknown)	17s
build (1.85, thumbv7em-none-eabi)	19s
build (stable, thumbv7em-none-eabi)	9s
test (1.85)	2m 39s
build (1.85, wasm32-unknown-unknown)	17s
	5m 46s

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