add lua embedding query for semantic search

crates/zed/src/languages/lua/config.toml

@@ -7,3 +7,4 @@ brackets = [
     { start = "[", end = "]", close = true, newline = true },
     { start = "\"", end = "\"", close = true, newline = false, not_in = ["string"] },
 ]
+collapsed_placeholder = "--[ ... ]--"

crates/zed/src/languages/lua/embedding.scm

@@ -0,0 +1,10 @@
+(
+    (comment)* @context
+    .
+    (function_declaration
+        "function" @name
+        name: (_) @name
+        (comment)* @collapse
+        body: (block) @collapse
+    ) @item
+)