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

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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>),