feat: esplora client #29

Job	Run time
Lint (fmt + clippy)	49s
Lint (fmt + clippy)	49s
Build and test (stable, all)	1m 31s
Build and test (stable, all)	1m 31s
Build and test (stable, debug,default)	1m 56s
Build and test (stable, debug,default)	1m 56s
Build and test (stable, debug,esplora)	2m 34s
Build and test (stable, debug,esplora)	1m 58s
Build and test (stable, debug,snap)	2m 32s
Build and test (stable, debug,snap)	1m 58s
Build and test (1.73.0, all)	1m 35s
Build and test (1.73.0, all)	1m 35s
Build and test (1.73.0, debug,default)	2m 13s
Build and test (1.73.0, debug,default)	2m 13s
Build and test (1.73.0, debug,esplora)	2m 19s
Build and test (1.73.0, debug,esplora)	2m 2s
Build and test (1.73.0, debug,snap)	2m 33s
Build and test (1.73.0, debug,snap)	2m 3s
	34m 7s

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