feat: phoenixd ln backend #1142

Job	Run time
Build (stable, -p cdk)	1m 11s
Format	5s
Build WASM (stable, -p cdk)	1m 30s
Build (stable, -p cdk --no-default-features)	1m 8s
Build WASM (stable, -p cdk --no-default-features)	1m 16s
Build (stable, -p cdk --no-default-features --features wallet)	1m 11s
Run Examples (stable, mint-token)	30s
Build WASM (stable, -p cdk --no-default-features --features wallet)	1m 22s
Build (stable, -p cdk --no-default-features --features mint)	1m 8s
Run Examples (stable, p2pk)	29s
Build WASM (stable, -p cdk-js)	1m 38s
Run Examples (stable, proof-selection)	26s
Build (stable, -p cdk-redb)	1m 29s
Run Examples (stable, wallet)	19s
Build (stable, -p cdk-sqlite)	1m 49s
Build (stable, -p cdk-axum)	1m 3s
Build (stable, -p cdk-cln)	1m 16s
Build (stable, -p cdk-phoenixd)	1m 12s
Build (stable, -p cdk-strike)	1m 4s
Build (stable, -p cdk-lnbits -p cdk-integration-tests)	52s
Build (stable, -p cdk-fake-wallet)	1m 8s
Build (stable, --bin cdk-cli)	2m 38s
Build (stable, --bin cdk-mintd)	2m 39s
	27m 23s

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