Refactor bdk-cli structure #1139

Job	Run time
Clippy (--all-features)	1m 13s
Rust fmt	21s
Build and test (stable, --no-default-features)	41s
Build and test (stable, --features default)	40s
Build and test (stable, --all-features)	1m 47s
Clippy (--no-default-features)	29s
	5m 11s

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