Implement LS on string-literal of dynamic import

src/services/findAllReferences.ts

@@ -307,7 +307,7 @@ namespace ts.FindAllReferences.Core {
             case SyntaxKind.ExportDeclaration:
                 return true;
             case SyntaxKind.CallExpression:
-                return isRequireCall(node.parent as CallExpression, /*checkArgumentIsStringLiteral*/ false);
+                return isRequireCall(node.parent as CallExpression, /*checkArgumentIsStringLiteral*/ false) || isImportCall(node.parent as CallExpression);
             default:
                 return false;
         }