message: `rust-server-codegen`: make operation input / output wrappers public
diff: @@ -145,7 +145,7 @@ private class ServerHttpProtocolImplGenerator(
  }
  rustTemplate(
  """
  - pub(crate) struct $inputName(#{I});
  + pub struct $inputName(pub #{I});
  ##[#{Axum}::async_trait]
  impl<B> #{Axum}::extract::FromRequest<B> for $inputName
  where
  @@ -194,7 +194,7 @@ private class ServerHttpProtocolImplGenerator(
  // that can in turn be converted into a response.
  rustTemplate(
  """
  - pub(crate) enum $outputName {
  + pub enum $outputName {
  Output(#{O}),
  Error(#{E})
  }
  @@ -228,7 +228,7 @@ private class ServerHttpProtocolImplGenerator(
  // we control that can in turn be converted into a response.
  rustTemplate(
  """
  - pub(crate) struct $outputName(#{O});
  + pub struct $outputName(pub #{O});
  ##[#{Axum}::async_trait]
  impl #{Axum}::response::IntoResponse for $outputName {
  type Body = #{SmithyHttpServer}::Body;
  