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/error.rs

@@ -20,6 +20,7 @@ impl std::error::Error for ErrorData {}
 /// This is an unified error type for the errors could be returned by the service.
 #[derive(Debug, thiserror::Error)]
 #[allow(clippy::large_enum_variant)]
+#[non_exhaustive]
 pub enum RmcpError {
     #[cfg(any(feature = "client", feature = "server"))]
     #[error("Service error: {0}")]