Add methods to `Descriptor` + `DescriptorPublicKey` #1112

Job	Run time
Build and test Windows wheels (3.8)	5m 56s
Build and test macOS arm64 wheels (3.8)	7m 2s
Build and test Manylinux 2.28 x86_64 wheels (cp38-cp38)	3m 47s
Build and test Windows wheels (3.9)	6m 10s
Build and test macOS x86_64 wheels (3.8)	6m 5s
Build and test Manylinux 2.28 x86_64 wheels (cp39-cp39)	3m 41s
Build and test Windows wheels (3.10)	5m 20s
Build and test macOS arm64 wheels (3.9)	5m 29s
Build and test macOS x86_64 wheels (3.9)	5m 9s
Build and test Manylinux 2.28 x86_64 wheels (cp310-cp310)	3m 35s
Build and test Windows wheels (3.11)	8m 8s
Build and test macOS arm64 wheels (3.10)	4m 38s
Build and test macOS x86_64 wheels (3.10)	5m 0s
Build and test Manylinux 2.28 x86_64 wheels (cp311-cp311)	3m 39s
Build and test macOS arm64 wheels (3.11)	7m 55s
Build and test Windows wheels (3.12)	6m 2s
Build and test Manylinux 2.28 x86_64 wheels (cp312-cp312)	3m 39s
Build and test macOS x86_64 wheels (3.11)	5m 54s
Build and test macOS arm64 wheels (3.12)	6m 10s
Build and test macOS x86_64 wheels (3.12)	4m 50s
	1h 48m 9s

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