Add get_fee_estimates to EsploraClient #1197

Job	Run time
Build and test macOS x86_64 wheels (3.8)	4m 41s
Build and test macOS arm64 wheels (3.8)	11m 1s
Build and test macOS x86_64 wheels (3.9)	5m 33s
Build and test Manylinux 2.28 x86_64 wheels (cp38-cp38)	3m 44s
Build and test macOS arm64 wheels (3.9)	7m 59s
Build and test Windows wheels (3.8)	6m 27s
Build and test macOS x86_64 wheels (3.10)	9m 30s
Build and test Manylinux 2.28 x86_64 wheels (cp39-cp39)	3m 44s
Build and test macOS arm64 wheels (3.10)	7m 35s
Build and test Windows wheels (3.9)	6m 14s
Build and test Manylinux 2.28 x86_64 wheels (cp310-cp310)	3m 45s
Build and test macOS x86_64 wheels (3.11)	5m 6s
Build and test macOS arm64 wheels (3.11)	10m 9s
Build and test Windows wheels (3.10)	5m 32s
Build and test Manylinux 2.28 x86_64 wheels (cp311-cp311)	3m 49s
Build and test macOS x86_64 wheels (3.12)	7m 38s
Build and test macOS arm64 wheels (3.12)	6m 8s
Build and test Windows wheels (3.11)	6m 14s
Build and test Manylinux 2.28 x86_64 wheels (cp312-cp312)	3m 48s
Build and test Windows wheels (3.12)	6m 6s
	2h 4m 43s

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