Add methods to `Descriptor` + `DescriptorPublicKey` #1084

Job	Run time
Build and test macOS x86_64 wheels (3.8)	5m 40s
Build and test macOS arm64 wheels (3.8)	5m 4s
Build and test Windows wheels (3.8)	5m 29s
Build and test macOS arm64 wheels (3.9)	8m 2s
Build and test Manylinux 2.28 x86_64 wheels (cp38-cp38)	3m 39s
Build and test Windows wheels (3.9)	6m 4s
Build and test Manylinux 2.28 x86_64 wheels (cp39-cp39)	3m 38s
Build and test macOS arm64 wheels (3.10)	9m 11s
Build and test Windows wheels (3.10)	6m 18s
Build and test macOS x86_64 wheels (3.9)	9m 36s
Build and test Manylinux 2.28 x86_64 wheels (cp310-cp310)	3m 39s
Build and test macOS arm64 wheels (3.11)	7m 18s
Build and test Windows wheels (3.11)	5m 54s
Build and test Manylinux 2.28 x86_64 wheels (cp311-cp311)	3m 32s
Build and test macOS arm64 wheels (3.12)	8m 56s
Build and test macOS x86_64 wheels (3.10)	7m 10s
Build and test Windows wheels (3.12)	5m 54s
Build and test Manylinux 2.28 x86_64 wheels (cp312-cp312)	3m 43s
Build and test macOS x86_64 wheels (3.11)	7m 13s
Build and test macOS x86_64 wheels (3.12)	5m 26s
	2h 1m 26s

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