Function run_with_vault 

pub async fn run_with_vault<R, W>(
    config: Config,
    vault: Vault,
    stdin: R,
    stdout: W,
) -> Result<()>
where
    R: AsyncRead + Unpin + Send + 'static,
    W: AsyncWrite + Unpin + Send + 'static,

Runs the proxy with an explicit vault.