Merge rust-bitcoin/rust-miniscript#787: fuzz: add target for `Descrip… #2139

Job	Run time
Test - nightly toolchain (minimal)	14m 19s
Test - nightly toolchain (recent)	14m 17s
Docs - nightly toolchain (recent)	38s
Embedded	1m 21s
Bench - nightly toolchain (recent)	3m 13s
Format - nightly toolchain	12s
Integration tests - stable toolchain (26_0)	49s
Lint - nightly toolchain (recent)	51s
Integration tests - stable toolchain (25_2)	50s
Test - stable toolchain (minimal)	15m 56s
Integration tests - stable toolchain (25_1)	59s
Test - stable toolchain (recent)	15m 56s
Docs - stable toolchain (recent)	31s
Integration tests - stable toolchain (25_0)	49s
Integration tests - stable toolchain (24_2)	48s
Integration tests - stable toolchain (24_1)	57s
Test - 1.63.0 toolchain (minimal)	26m 22s
Integration tests - stable toolchain (24_0_1)	51s
Test - 1.63.0 toolchain (recent)	25m 4s
Integration tests - stable toolchain (23_2)	48s
Integration tests - stable toolchain (23_1)	51s
Integration tests - stable toolchain (23_0)	56s
Integration tests - stable toolchain (22_1)	49s
Integration tests - stable toolchain (22_0)	49s
Integration tests - stable toolchain (0_21_2)	53s
Integration tests - stable toolchain (0_20_2)	46s
Integration tests - stable toolchain (0_19_1)	44s
Integration tests - stable toolchain (0_18_1)	58s
Integration tests - stable toolchain (0_17_1)	56s
	2h 13m 13s

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