Add fuzzing target to fuzz return type and parameters #820

Job	Run time
spell check with typos	5s
docs-pr	3s
fuzzing / fuzz (host_print)	9m 49s
fuzzing / fuzz (guest_call)	9m 42s
rust / build (hyperv, intel, debug)	23s
rust / build (mshv, amd, release)	20s
rust / build (hyperv, intel, release)	23s
rust / build (hyperv, amd, release)	23s
rust / build (hyperv, amd, debug)	22s
rust / build (mshv3, amd, debug)	21s
rust / build (mshv, intel, release)	21s
rust / build (mshv, intel, debug)	20s
rust / build (mshv, amd, debug)	20s
rust / build (mshv3, amd, release)	21s
rust / build (mshv3, intel, debug)	21s
rust / build (kvm, intel, debug)	18s
rust / build (kvm, amd, release)	19s
rust / build (kvm, amd, debug)	18s
rust / build (mshv3, intel, release)	20s
rust / build (kvm, intel, release)	19s
	25m 8s

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