Remove server_args from LspAdapter

Prepare to remove concept of a runtime from greater server startup code,
which is important for future language server extensibility

Co-Authored-By: Antonio Scandurra <me@as-cii.com>

crates/zed/src/languages/elixir.rs

@@ -44,7 +44,7 @@ impl LspAdapter for ElixirLspAdapter {
         version: Box<dyn 'static + Send + Any>,
         http: Arc<dyn HttpClient>,
         container_dir: PathBuf,
-    ) -> Result<PathBuf> {
+    ) -> Result<LanguageServerBinary> {
         let version = version.downcast::<GitHubLspBinaryVersion>().unwrap();
         let zip_path = container_dir.join(format!("elixir-ls_{}.zip", version.name));
         let version_dir = container_dir.join(format!("elixir-ls_{}", version.name));
@@ -98,17 +98,24 @@ impl LspAdapter for ElixirLspAdapter {
             }
         }
 
-        Ok(binary_path)
+        Ok(LanguageServerBinary {
+            path: binary_path,
+            arguments: vec![],
+        })
     }
 
-    async fn cached_server_binary(&self, container_dir: PathBuf) -> Option<PathBuf> {
+    async fn cached_server_binary(&self, container_dir: PathBuf) -> Option<LanguageServerBinary> {
         (|| async move {
             let mut last = None;
             let mut entries = fs::read_dir(&container_dir).await?;
             while let Some(entry) = entries.next().await {
                 last = Some(entry?.path());
             }
-            last.ok_or_else(|| anyhow!("no cached binary"))
+            last.map(|path| LanguageServerBinary {
+                path,
+                arguments: vec![],
+            })
+            .ok_or_else(|| anyhow!("no cached binary"))
         })()
         .await
         .log_err()