Add fuzzing target to fuzz return type and parameters #841

Job	Run time
spell check with typos	4s
docs-pr	3s
fuzzing / fuzz (host_print)	9m 36s
rust / build (hyperv, amd, debug)	18m 28s
fuzzing / fuzz (guest_call)	9m 33s
fuzzing / fuzz (host_call)	9m 29s
rust / build (hyperv, amd, release)	24m 32s
rust / build (hyperv, intel, debug)	18m 54s
rust / build (hyperv, intel, release)	23m 22s
rust / build (mshv, amd, debug)	12m 0s
rust / build (mshv, amd, release)	16m 2s
rust / build (mshv, intel, debug)	11m 15s
rust / build (mshv, intel, release)	16m 46s
rust / build (mshv3, amd, debug)	12m 27s
rust / build (mshv3, amd, release)	16m 53s
rust / build (mshv3, intel, debug)	11m 13s
rust / build (mshv3, intel, release)	15m 2s
rust / build (kvm, amd, debug)	13m 32s
rust / build (kvm, amd, release)	16m 38s
rust / build (kvm, intel, debug)	12m 32s
rust / build (kvm, intel, release)	16m 4s
	4h 44m 25s

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