Add judge to new eval + provide LSP diagnostics (#28713)

Release Notes:

- N/A

---------

Co-authored-by: Antonio Scandurra <antonio@zed.dev>
Co-authored-by: agus <agus@zed.dev>

crates/language_model/src/language_model.rs

@@ -83,7 +83,7 @@ pub enum StopReason {
     ToolUse,
 }
 
-#[derive(Debug, PartialEq, Clone, Serialize, Deserialize, Default)]
+#[derive(Debug, PartialEq, Clone, Copy, Serialize, Deserialize, Default)]
 pub struct TokenUsage {
     #[serde(default, skip_serializing_if = "is_default")]
     pub input_tokens: u32,