Fuzz

Merge ElementsProject/elements-miniscript#96: Pegin desc wildcard #164

Job	Run time
fuzz (roundtrip_miniscript_str)	2m 47s
fuzz (roundtrip_miniscript_script)	2m 52s
fuzz (parse_descriptor)	3m 10s
fuzz (roundtrip_semantic)	5m 5s
fuzz (parse_descriptor_secret)	2m 54s
fuzz (roundtrip_descriptor)	2m 51s
fuzz (roundtrip_concrete)	3m 2s
fuzz (compile_descriptor)	3m 4s
fuzz (roundtrip_confidential)	3m 3s
verify-execution	5s
	28m 53s

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