Fuzz

Depend on bitcoin `v0.32.0-rc` #409

Job	Run time
fuzz (roundtrip_semantic)	2m 44s
fuzz (parse_descriptor)	2m 36s
fuzz (parse_descriptor_secret)	2m 37s
fuzz (roundtrip_miniscript_script)	2m 38s
fuzz (roundtrip_miniscript_str)	2m 47s
fuzz (roundtrip_descriptor)	2m 42s
fuzz (roundtrip_concrete)	2m 47s
fuzz (compile_descriptor)	2m 41s
verify-execution	8s
	21m 40s

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