hmac: add `EagerHash` (#151) #32

Job	Run time
build (1.57.0, thumbv7em-none-eabi)	1m 49s
build (1.57.0, wasm32-unknown-unknown)	2m 27s
build (stable, thumbv7em-none-eabi)	18s
test (1.57.0)	1m 44s
build (stable, wasm32-unknown-unknown)	10s
test (stable)	25s
minimal-versions / minimal-versions	26s
	7m 19s

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