Add methods to `Descriptor` + `DescriptorPublicKey` #1086

Job	Run time
Build and test macOS x86_64 wheels (3.8)	6m 2s
Build and test macOS arm64 wheels (3.8)	9m 50s
Build and test macOS x86_64 wheels (3.9)	8m 36s
Build and test macOS arm64 wheels (3.9)	6m 54s
Build and test macOS x86_64 wheels (3.10)	4m 49s
Build and test Manylinux 2.28 x86_64 wheels (cp38-cp38)	3m 48s
Build and test Windows wheels (3.8)	5m 45s
Build and test macOS x86_64 wheels (3.11)	6m 10s
Build and test macOS arm64 wheels (3.10)	10m 41s
Build and test Manylinux 2.28 x86_64 wheels (cp39-cp39)	4m 0s
Build and test Windows wheels (3.9)	5m 43s
Build and test macOS x86_64 wheels (3.12)	6m 13s
Build and test macOS arm64 wheels (3.11)	6m 10s
Build and test Manylinux 2.28 x86_64 wheels (cp310-cp310)	3m 40s
Build and test Windows wheels (3.10)	5m 33s
Build and test macOS arm64 wheels (3.12)	6m 22s
Build and test Manylinux 2.28 x86_64 wheels (cp311-cp311)	3m 46s
Build and test Windows wheels (3.11)	5m 56s
Build and test Manylinux 2.28 x86_64 wheels (cp312-cp312)	3m 53s
Build and test Windows wheels (3.12)	5m 22s
	1h 59m 13s

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