Init fuzzing harnesses for scalars and points #362

Job	Run time
build (1.81.0, thumbv7em-none-eabi)	21s
build (1.81.0, wasm32-unknown-unknown)	22s
build (stable, thumbv7em-none-eabi)	22s
build (stable, wasm32-unknown-unknown)	22s
cross (armv7-unknown-linux-gnueabihf, 1.81.0)	1m 40s
cross (armv7-unknown-linux-gnueabihf, stable)	1m 45s
cross (aarch64-unknown-linux-gnu, 1.81.0)	1m 24s
doc	57s
cross (aarch64-unknown-linux-gnu, stable)	1m 15s
cross (powerpc-unknown-linux-gnu, 1.81.0)	1m 26s
cross (powerpc-unknown-linux-gnu, stable)	1m 29s
test (i686-unknown-linux-gnu, 1.81.0, sudo apt update && sudo apt install gcc-multilib)	1m 20s
test (i686-unknown-linux-gnu, stable, sudo apt update && sudo apt install gcc-multilib)	1m 23s
test (x86_64-unknown-linux-gnu, 1.81.0)	1m 5s
test (x86_64-unknown-linux-gnu, stable)	1m 8s
	16m 19s

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