Show function parameters in elixir outline view

Introduce a new capture in the outline query called 'context.extra', which
causes text to appear in the outline, but not in the breadcrumbs.

crates/zed/src/languages/elixir/indents.scm

@@ -1,6 +1,4 @@
-[
-    (call)
-] @indent
+(call) @indent
 
 (_ "[" "]" @end) @indent
 (_ "{" "}" @end) @indent

crates/zed/src/languages/elixir/outline.scm

@@ -8,9 +8,19 @@
   (arguments
     [
       (identifier) @name
-      (call target: (identifier) @name)
+      (call
+          target: (identifier) @name
+          (arguments
+              "(" @context.extra
+              _* @context.extra
+              ")" @context.extra))
       (binary_operator
-        left: (call target: (identifier) @name)
+        left: (call
+            target: (identifier) @name
+            (arguments
+                "(" @context.extra
+                _* @context.extra
+                ")" @context.extra))
         operator: "when")
     ])
   (#match? @context "^(def|defp|defdelegate|defguard|defguardp|defmacro|defmacrop|defn|defnp)$")) @item

crates/zed/src/languages/typescript.rs

@@ -327,10 +327,10 @@ mod tests {
                 .map(|item| (item.text.as_str(), item.depth))
                 .collect::<Vec<_>>(),
             &[
-                ("function a ( )", 0),
-                ("async function a2 ( )", 1),
+                ("function a()", 0),
+                ("async function a2()", 1),
                 ("let b", 0),
-                ("function getB ( )", 0),
+                ("function getB()", 0),
                 ("const d", 0),
             ]
         );