Fuzz

Merge rust-bitcoin/rust-miniscript#634: fuzz: cover taproot in `round… #291

Job	Run time
fuzz (roundtrip_semantic)	2m 57s
fuzz (parse_descriptor)	2m 57s
fuzz (parse_descriptor_secret)	3m 3s
fuzz (roundtrip_miniscript_script)	3m 2s
fuzz (roundtrip_miniscript_str)	2m 57s
fuzz (roundtrip_descriptor)	3m 0s
fuzz (roundtrip_concrete)	2m 56s
fuzz (compile_descriptor)	3m 1s
verify-execution	10s
	24m 3s

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