Add methods to `Descriptor` + `DescriptorPublicKey` #1093

Job	Run time
Build and test macOS arm64 wheels (3.8)	5m 5s
Build and test macOS x86_64 wheels (3.8)	5m 20s
Build and test macOS arm64 wheels (3.9)	5m 33s
Build and test Manylinux 2.28 x86_64 wheels (cp38-cp38)	3m 40s
Build and test macOS x86_64 wheels (3.9)	5m 55s
Build and test macOS arm64 wheels (3.10)	5m 41s
Build and test Manylinux 2.28 x86_64 wheels (cp39-cp39)	3m 39s
Build and test macOS x86_64 wheels (3.10)	4m 58s
Build and test macOS arm64 wheels (3.11)	4m 39s
Build and test Manylinux 2.28 x86_64 wheels (cp310-cp310)	3m 50s
Build and test macOS x86_64 wheels (3.11)	7m 43s
Build and test macOS arm64 wheels (3.12)	8m 0s
Build and test Manylinux 2.28 x86_64 wheels (cp311-cp311)	3m 35s
Build and test macOS x86_64 wheels (3.12)	5m 55s
Build and test Manylinux 2.28 x86_64 wheels (cp312-cp312)	3m 48s
Build and test Windows wheels (3.8)	5m 57s
Build and test Windows wheels (3.9)	6m 1s
Build and test Windows wheels (3.10)	5m 36s
Build and test Windows wheels (3.11)	5m 24s
Build and test Windows wheels (3.12)	5m 34s
	1h 45m 53s

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