fix(gadget-blueprint-serde)!: handle bytes properly

[Serial-ATA]

With Field::List and Field::Bytes being distinct types, we'll have to rely on serde_bytes::ByteBuf to call the serialize_byte_buf method. That means any job returning Vec<u8> should now return ByteBuf, which has been re-exported in the SDK.

Simply:

fn my_job() -> Result<Vec<u8>> {
	Ok(some_vec)
}

To:

use gadget_sdk::ByteBuf;

fn my_job() -> Result<ByteBuf> {
	Ok(some_vec.into())
}

[shekohex]

Looks good