chore: add #[non_exhaustive] and mutation methods to improve compatibility (#715)

* chore: add #[non_exhaustive] to reduce backwards-incompatible changes going forward

* fix: remove ProtocolVersion import

* fix: add a few more with_ mutator methods

---------

Co-authored-by: Alex Hancock <alexhancock@block.xyz>

crates/rmcp/src/service/client.rs

@@ -25,6 +25,7 @@ use crate::{
 ///
 /// if you want to handle the error, you can use `serve_client_with_ct` or `serve_client` with `Result<RunningService<RoleClient, S>, ClientError>`
 #[derive(Error, Debug)]
+#[non_exhaustive]
 pub enum ClientInitializeError {
     #[error("expect initialized response, but received: {0:?}")]
     ExpectedInitResponse(Option<ServerJsonRpcMessage>),

crates/rmcp/src/service/server.rs

@@ -47,6 +47,7 @@ impl ServiceRole for RoleServer {
 ///
 /// if you want to handle the error, you can use `serve_server_with_ct` or `serve_server` with `Result<RunningService<RoleServer, S>, ServerError>`
 #[derive(Error, Debug)]
+#[non_exhaustive]
 pub enum ServerInitializeError {
     #[error("expect initialized request, but received: {0:?}")]
     ExpectedInitializeRequest(Option<ClientJsonRpcMessage>),
@@ -457,6 +458,7 @@ impl Peer<RoleServer> {
 /// Errors that can occur during typed elicitation operations
 #[cfg(feature = "elicitation")]
 #[derive(Error, Debug)]
+#[non_exhaustive]
 pub enum ElicitationError {
     /// The elicitation request failed at the service level
     #[error("Service error: {0}")]
@@ -808,6 +810,7 @@ impl Peer<RoleServer> {
     ///     ElicitationAction::Cancel => {
     ///         println!("User cancelled/dismissed the request");
     ///     }
+    ///     _ => {}
     ///  }
     ///  Ok(())
     /// }
@@ -858,6 +861,7 @@ impl Peer<RoleServer> {
     ///     ElicitationAction::Cancel => {
     ///         println!("User cancelled/dismissed the request");
     ///     }
+    ///     _ => {}
     ///  }
     ///  Ok(())
     /// }