JS: Add basic test for 'import defer' syntax in TypeScript

Author: asgerf

javascript/ql/test/library-tests/TypeScript/ImportDefer/test.expected

@@ -0,0 +1 @@
+| tst.ts:1:1:1:31 | import  ... m "fs"; |

javascript/ql/test/library-tests/TypeScript/ImportDefer/test.ql

@@ -0,0 +1,5 @@
+import javascript
+
+from ImportDeclaration decl
+select decl
+

javascript/ql/test/library-tests/TypeScript/ImportDefer/tst.ts

@@ -0,0 +1 @@
+import defer * as fs from "fs";