Expose more errors from rust-analyzer on invalid Cargo.toml contents (#8356)

Release Notes:

- Fixed ([#7574](https://github.com/zed-industries/zed/issues/7574)).

crates/lsp/src/lsp.rs

@@ -164,6 +164,34 @@ struct Error {
     message: String,
 }
 
+/// Experimental: Informs the end user about the state of the server
+///
+/// [Rust Analyzer Specification](https://github.com/rust-lang/rust-analyzer/blob/master/docs/dev/lsp-extensions.md#server-status)
+#[derive(Debug)]
+pub enum ServerStatus {}
+
+/// Other(String) variant to handle unknown values due to this still being experimental
+#[derive(Debug, PartialEq, Deserialize, Serialize, Clone)]
+#[serde(rename_all = "camelCase")]
+pub enum ServerHealthStatus {
+    Ok,
+    Warning,
+    Error,
+    Other(String),
+}
+
+#[derive(Debug, PartialEq, Deserialize, Serialize, Clone)]
+#[serde(rename_all = "camelCase")]
+pub struct ServerStatusParams {
+    pub health: ServerHealthStatus,
+    pub message: Option<String>,
+}
+
+impl lsp_types::notification::Notification for ServerStatus {
+    type Params = ServerStatusParams;
+    const METHOD: &'static str = "experimental/serverStatus";
+}
+
 impl LanguageServer {
     /// Starts a language server process.
     pub fn new(