Add ELIP-deterministic-descriptor-blinding-key module #73

Job	Run time
fuzz (roundtrip_miniscript_str)	3m 31s
fuzz (roundtrip_miniscript_script)	3m 36s
fuzz (parse_descriptor)	3m 29s
fuzz (roundtrip_semantic)	3m 29s
fuzz (parse_descriptor_secret)	3m 28s
fuzz (roundtrip_descriptor)	3m 36s
fuzz (roundtrip_concrete)	3m 29s
fuzz (compile_descriptor)	3m 33s
fuzz (roundtrip_confidential)	3m 38s
verify-execution	7s
	31m 56s

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