Add fuzzing target to fuzz return type and parameters #830

Job	Run time
docs-pr	4s
spell check with typos	5s
fuzzing / fuzz (guest_call)	9m 37s
rust / build (hyperv, intel, release)	24m 6s
rust / build (hyperv, amd, debug)	17m 47s
fuzzing / fuzz (host_print)	9m 39s
rust / build (mshv3, amd, debug)	11m 50s
rust / build (mshv, intel, release)	17m 7s
rust / build (hyperv, intel, debug)	17m 15s
rust / build (mshv, amd, debug)	13m 1s
rust / build (mshv3, intel, release)	14m 52s
rust / build (mshv, amd, release)	16m 36s
rust / build (mshv, intel, debug)	11m 40s
rust / build (hyperv, amd, release)	23m 46s
rust / build (mshv3, intel, debug)	12m 31s
rust / build (kvm, intel, debug)	11m 27s
rust / build (kvm, amd, debug)	12m 46s
rust / build (mshv3, amd, release)	16m 18s
rust / build (kvm, amd, release)	16m 37s
rust / build (kvm, intel, release)	16m 2s
	4h 33m 6s

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