Fuzz

Depend on bitcoin `v0.32.0-rc` #412

Job	Run time
fuzz (roundtrip_semantic)	2m 43s
fuzz (parse_descriptor)	2m 56s
fuzz (parse_descriptor_secret)	2m 48s
fuzz (roundtrip_miniscript_script)	2m 54s
fuzz (roundtrip_miniscript_str)	3m 57s
fuzz (roundtrip_descriptor)	2m 50s
fuzz (roundtrip_concrete)	2m 46s
fuzz (compile_descriptor)	2m 46s
verify-execution	6s
	23m 46s

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