feat: phoenixd ln backend #977

Job	Run time
Build WASM (stable, -p cdk)	1m 18s
Build (stable, -p cdk)	1m 25s
Build WASM (stable, -p cdk --no-default-features)	3m 27s
Format	5s
Build (stable, -p cdk --no-default-features)	1m 12s
Build WASM (stable, -p cdk --no-default-features --features wallet)	1m 22s
Build (stable, -p cdk --no-default-features --features wallet)	1m 27s
Build WASM (stable, -p cdk-js)	1m 28s
Build (stable, -p cdk --no-default-features --features mint)	1m 14s
Build (stable, -p cdk-redb)	1m 35s
Build (stable, -p cdk-sqlite)	2m 22s
Build (stable, -p cdk-axum)	1m 18s
Build (stable, -p cdk-cln)	1m 23s
Build (stable, -p cdk-fake-wallet)	1m 16s
Build (stable, -p cdk-strike)	1m 33s
Build (stable, --bin cdk-cli)	2m 41s
Build (stable, --bin cdk-mintd)	2m 46s
Build (stable, --examples)	1m 34s
	29m 26s

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