feat: add get_fee_estimates to EsploraClient #1201

Job	Run time
Build and test macOS arm64 wheels (3.8)	7m 44s
Build and test macOS arm64 wheels (3.9)	6m 40s
Build and test macOS arm64 wheels (3.10)	7m 12s
Build and test macOS x86_64 wheels (3.8)	7m 38s
Build and test Manylinux 2.28 x86_64 wheels (cp38-cp38)	3m 51s
Build and test macOS arm64 wheels (3.11)	7m 7s
Build and test macOS x86_64 wheels (3.9)	6m 48s
Build and test Manylinux 2.28 x86_64 wheels (cp39-cp39)	3m 49s
Build and test macOS arm64 wheels (3.12)	5m 16s
Build and test macOS x86_64 wheels (3.10)	8m 10s
Build and test Manylinux 2.28 x86_64 wheels (cp310-cp310)	3m 43s
Build and test macOS x86_64 wheels (3.11)	7m 3s
Build and test Manylinux 2.28 x86_64 wheels (cp311-cp311)	3m 42s
Build and test macOS x86_64 wheels (3.12)	5m 22s
Build and test Windows wheels (3.8)	5m 57s
Build and test Manylinux 2.28 x86_64 wheels (cp312-cp312)	3m 52s
Build and test Windows wheels (3.9)	6m 6s
Build and test Windows wheels (3.10)	6m 15s
Build and test Windows wheels (3.11)	6m 0s
Build and test Windows wheels (3.12)	5m 48s
	1h 58m 3s

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