Add proxy support #985

Job	Run time
Build WASM (stable, -p cdk)	41s
Build (stable, -p cdk)	1m 13s
Build WASM (stable, -p cdk --no-default-features)	12s
Format	4s
Build (stable, -p cdk --no-default-features)	13s
Build WASM (stable, -p cdk --no-default-features --features wallet)	29s
Build (stable, -p cdk --no-default-features --features wallet)	1m 9s
Build WASM (stable, -p cdk-js)	1m 14s
Build (stable, -p cdk --no-default-features --features mint)	27s
Build (stable, -p cdk-redb)	1m 23s
Build (stable, -p cdk-sqlite)	1m 53s
Build (stable, -p cdk-axum)	1m 4s
Build (stable, -p cdk-cln)	1m 12s
Build (stable, -p cdk-fake-wallet)	55s
Build (stable, -p cdk-strike)	1m 23s
Build (stable, --bin cdk-cli)	2m 25s
Build (stable, --bin cdk-mintd)	2m 42s
Build (stable, --examples)	1m 34s
	20m 13s

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