Introduce new `bdk_coin_select` implementation #4220

Job	Run time
Check WASM	43s
Build and test (stable, true, --no-default-features)	2m 30s
Check no_std	45s
clippy_check	47s
Build and test (stable, true, --all-features)	5m 34s
Rust fmt	12s
Build and test (1.57.0, --no-default-features)	6m 11s
Build and test (1.57.0, --all-features)	4m 43s
	21m 25s

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