pub fn bytes<I, S>(mut self, paths: I) -> Self
    where
        I: IntoIterator<Item = S>,
        S: AsRef<str>,
    {
        self.bytes = Some(
            paths
                .into_iter()
                .map(|path| path.as_ref().to_string())
                .collect(),
        );
        self
    }
Configure the code generator to generate Rust `bytes::Bytes` fields for Protobuf `bytes`
type fields.

Passed directly to `prost_build::Config.bytes`.

Note: previous configured paths for `bytes` will be cleared.
tonic-build/src/prost.rs