feat(router): Make Routes::prepare public

tonic/src/service/router.rs

@@ -83,11 +83,11 @@ impl Routes {
  self
  }
 
- #[cfg(feature = "transport")]
- pub(crate) fn prepare(self) -> Self {
+ /// This makes axum perform update some internals of the router that improves perf.
+ ///
+ /// See <https://docs.rs/axum/latest/axum/routing/struct.Router.html#a-note-about-performance>
+ pub fn prepare(self) -> Self {
  Self {
- // this makes axum perform update some internals of the router that improves perf
- // see https://docs.rs/axum/latest/axum/routing/struct.Router.html#a-note-about-performance
  router: self.router.with_state(()),
  }
  }