build(rust): vendor rnix parser crate

third_party/crates/rnix-0.14.0/test_data/parser/success/apply.expect

@@ -0,0 +1,18 @@
+NODE_ROOT@0..9
+  NODE_BIN_OP@0..9
+    NODE_APPLY@0..5
+      NODE_APPLY@0..3
+        NODE_IDENT@0..1
+          TOKEN_IDENT@0..1 "a"
+        TOKEN_WHITESPACE@1..2 " "
+        NODE_LITERAL@2..3
+          TOKEN_INTEGER@2..3 "1"
+      TOKEN_WHITESPACE@3..4 " "
+      NODE_LITERAL@4..5
+        TOKEN_INTEGER@4..5 "2"
+    TOKEN_WHITESPACE@5..6 " "
+    TOKEN_ADD@6..7 "+"
+    TOKEN_WHITESPACE@7..8 " "
+    NODE_LITERAL@8..9
+      TOKEN_INTEGER@8..9 "3"
+