Add get_fee_estimates to EsploraClient #1196

Job	Run time
Build and test macOS arm64 wheels (3.8)	5m 58s
Build and test macOS x86_64 wheels (3.8)	6m 56s
Build and test macOS arm64 wheels (3.9)	8m 7s
Build and test Manylinux 2.28 x86_64 wheels (cp38-cp38)	3m 48s
Build and test macOS x86_64 wheels (3.9)	7m 39s
Build and test macOS arm64 wheels (3.10)	8m 18s
Build and test Windows wheels (3.8)	5m 26s
Build and test macOS x86_64 wheels (3.10)	4m 26s
Build and test Manylinux 2.28 x86_64 wheels (cp39-cp39)	3m 47s
Build and test macOS arm64 wheels (3.11)	5m 40s
Build and test Manylinux 2.28 x86_64 wheels (cp310-cp310)	3m 45s
Build and test macOS arm64 wheels (3.12)	6m 34s
Build and test macOS x86_64 wheels (3.11)	12m 54s
Build and test Manylinux 2.28 x86_64 wheels (cp311-cp311)	3m 58s
Build and test Windows wheels (3.9)	5m 43s
Build and test macOS x86_64 wheels (3.12)	9m 7s
Build and test Manylinux 2.28 x86_64 wheels (cp312-cp312)	3m 44s
Build and test Windows wheels (3.10)	5m 54s
Build and test Windows wheels (3.11)	5m 42s
Build and test Windows wheels (3.12)	6m 1s
	2h 3m 27s

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