fuzz: add target for `Descriptor::parse_descriptor` #2137

Job	Run time
Test - 1.63.0 toolchain (minimal)	25m 39s
Test - nightly toolchain (minimal)	13m 53s
Test - stable toolchain (minimal)	15m 49s
Test - nightly toolchain (recent)	14m 11s
Lint - nightly toolchain (recent)	31s
Test - stable toolchain (recent)	16m 51s
Test - 1.63.0 toolchain (recent)	25m 7s
Bench - nightly toolchain (recent)	3m 26s
Docs - stable toolchain (recent)	59s
Docs - nightly toolchain (recent)	38s
Embedded	1m 19s
Format - nightly toolchain	14s
Integration tests - stable toolchain (26_0)	58s
Integration tests - stable toolchain (25_2)	48s
Integration tests - stable toolchain (25_1)	46s
Integration tests - stable toolchain (25_0)	47s
Integration tests - stable toolchain (24_2)	46s
Integration tests - stable toolchain (24_1)	48s
Integration tests - stable toolchain (24_0_1)	52s
Integration tests - stable toolchain (23_2)	2m 6s
Integration tests - stable toolchain (23_1)	1m 24s
Integration tests - stable toolchain (23_0)	48s
Integration tests - stable toolchain (22_1)	47s
Integration tests - stable toolchain (22_0)	1m 3s
Integration tests - stable toolchain (0_21_2)	47s
Integration tests - stable toolchain (0_20_2)	47s
Integration tests - stable toolchain (0_19_1)	47s
Integration tests - stable toolchain (0_18_1)	58s
Integration tests - stable toolchain (0_17_1)	1m 55s
	2h 15m 44s

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