Capture language server stderr during startup/init and log if failure

crates/prettier/Cargo.toml

@@ -27,6 +27,7 @@ serde_derive.workspace = true
 serde_json.workspace = true
 anyhow.workspace = true
 futures.workspace = true
+parking_lot.workspace = true
 
 [dev-dependencies]
 language = { path = "../language", features = ["test-support"] }

crates/prettier/src/prettier.rs

@@ -210,6 +210,7 @@ impl Prettier {
             .spawn(async move { node.binary_path().await })
             .await?;
         let server = LanguageServer::new(
+            Arc::new(parking_lot::Mutex::new(None)),
             server_id,
             LanguageServerBinary {
                 path: node_path,