fix(sdk): Return `Bytes` when using `Vec<u8>` in params and result (#… #455

Job	Run time
Rustfmt	25s
integration-test-eigenlayer	6m 0s
cargo clippy	18m 27s
cargo test (gadget-sdk)	2m 45s
cargo test (blueprint-manager)	1m 21s
cargo test (gadget-context-derive)	9m 6s
cargo test (gadget-blueprint-proc-macro)	6m 8s
cargo test (gadget-blueprint-proc-macro-playground)	5m 17s
	49m 29s

Provide feedback