add test for await using in TypeScript

javascript/ql/test/library-tests/TypeScript/BindingPattern/VarDecl.expected

@@ -1,8 +1,3 @@
-consts
-| tst.tsx:2:3:2:26 | const { ...  } = o; |
-| tst.tsx:9:5:9:26 | const b ... efined; |
-usings
-| tst.tsx:7:5:7:28 | using f ... as any; |
 #select
 | tst.tsx:1:10:1:10 | f |
 | tst.tsx:1:12:1:12 | o |
@@ -10,3 +5,11 @@ usings
 | tst.tsx:6:10:6:10 | v |
 | tst.tsx:7:11:7:13 | foo |
 | tst.tsx:9:11:9:13 | bar |
+| tst.tsx:12:16:12:16 | b |
+| tst.tsx:13:17:13:19 | foo |
+consts
+| tst.tsx:2:3:2:26 | const { ...  } = o; |
+| tst.tsx:9:5:9:26 | const b ... efined; |
+usings
+| tst.tsx:7:5:7:28 | using f ... as any; |
+| tst.tsx:13:5:13:34 | await u ... as any; |

javascript/ql/test/library-tests/TypeScript/BindingPattern/tst.tsx

@@ -7,4 +7,8 @@ function v() {
     using foo = null as any;
 
     const bar = undefined;
+}
+
+async function b() {
+    await using foo = null as any;
 }