feat!(rust-only): Provide nicer interface to ErrorCode and add them to the docs (#301)

Breaking for Rust-side only, schema remains equivalent. But we now have a better description of the various error codes that can be used in the protocol and what they mean.

Author: benbrandt

Cargo.lock

@@ -28,6 +28,7 @@ derive_more = { version = "2", features = ["from", "display"] }
 schemars = { version = "1" }
 serde = { version = "1", features = ["derive", "rc"] }
 serde_json = { version = "1", features = ["raw_value"] }
+strum = { version = "0.27", features = ["derive"] }
 
 [lints.rust]
 future_incompatible = { level = "warn", priority = -1 }