pub fn route_name(mut self, route_name: impl AsRef<str>) -> Self {
        self.route_name = Some(route_name.as_ref().to_owned());
        self
    }
Set the route_name for this Method.

This value will be used as part of the route for calling this method.
Routes have the form: `/<package_name>.<service_name>/<method_route_name>`

Generally this is formatted in PascalCase.
tonic-build/src/manual.rs