Merge bitcoindevkit/bdk-cli#242: Payjoin persistence #1138

Job	Run time
Clippy (--all-features)	1m 18s
Rust fmt	23s
Clippy (--no-default-features)	41s
Build and test (stable, --all-features)	2m 0s
Build and test (stable, --features default)	49s
Build and test (stable, --no-default-features)	50s
	6m 1s

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