Add methods to `Descriptor` + `DescriptorPublicKey` #1085

Job	Run time
Build and test macOS arm64 wheels (3.8)	9m 6s
Build and test macOS arm64 wheels (3.9)	4m 25s
Build and test macOS arm64 wheels (3.10)	6m 36s
Build and test macOS arm64 wheels (3.11)	5m 21s
Build and test macOS arm64 wheels (3.12)	4m 47s
Build and test macOS x86_64 wheels (3.8)	4m 55s
Build and test macOS x86_64 wheels (3.9)	9m 0s
Build and test macOS x86_64 wheels (3.10)	4m 44s
Build and test macOS x86_64 wheels (3.11)	5m 58s
Build and test macOS x86_64 wheels (3.12)	6m 23s
Build and test Manylinux 2.28 x86_64 wheels (cp38-cp38)	3m 44s
Build and test Manylinux 2.28 x86_64 wheels (cp39-cp39)	3m 31s
Build and test Manylinux 2.28 x86_64 wheels (cp310-cp310)	3m 35s
Build and test Manylinux 2.28 x86_64 wheels (cp311-cp311)	3m 36s
Build and test Manylinux 2.28 x86_64 wheels (cp312-cp312)	3m 49s
Build and test Windows wheels (3.8)	5m 26s
Build and test Windows wheels (3.9)	5m 19s
Build and test Windows wheels (3.10)	6m 2s
Build and test Windows wheels (3.11)	5m 19s
Build and test Windows wheels (3.12)	5m 51s
	1h 47m 27s

Provide feedback