feat: greenlight ln backend #973

Job	Run time
Format	2s
Build (stable, -p cdk)	1m 21s
Build WASM (stable, -p cdk)	1m 19s
Build (stable, -p cdk --no-default-features)	3m 16s
Build WASM (stable, -p cdk --no-default-features)	3m 24s
Build (stable, -p cdk --no-default-features --features wallet)	1m 20s
Build WASM (stable, -p cdk --no-default-features --features wallet)	1m 20s
Build (stable, -p cdk --no-default-features --features mint)	1m 13s
Build WASM (stable, -p cdk-js)	1m 31s
Build (stable, -p cdk-redb)	1m 29s
Build (stable, -p cdk-sqlite)	2m 0s
Build (stable, -p cdk-axum)	1m 26s
Build (stable, -p cdk-cln)	1m 27s
Build (stable, -p cdk-fake-wallet)	1m 9s
Build (stable, -p cdk-strike)	1m 25s
Build (stable, --bin cdk-cli)	2m 44s
Build (stable, --bin cdk-mintd)	2m 50s
Build (stable, --examples)	1m 41s
	30m 57s

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