Add fuzzing target to fuzz return type and parameters #826

Job	Run time
docs-pr	4s
spell check with typos	4s
fuzzing / fuzz (host_print)	9m 32s
fuzzing / fuzz (guest_call)	9m 33s
rust / build (hyperv, intel, release)	22m 19s
rust / build (hyperv, amd, release)	22m 20s
rust / build (hyperv, intel, debug)	17m 9s
rust / build (mshv3, amd, debug)	12m 46s
rust / build (hyperv, amd, debug)	19m 33s
rust / build (kvm, intel, debug)	11m 47s
rust / build (kvm, amd, release)	16m 15s
rust / build (mshv3, amd, release)	16m 16s
rust / build (mshv, intel, debug)	11m 27s
rust / build (mshv, intel, release)	15m 33s
rust / build (kvm, intel, release)	16m 55s
rust / build (kvm, amd, debug)	13m 34s
rust / build (mshv3, intel, release)	15m 47s
rust / build (mshv, amd, release)	16m 38s
rust / build (mshv3, intel, debug)	11m 47s
rust / build (mshv, amd, debug)	12m 30s
	4h 31m 49s

Provide feedback