Implement LS on string-literal of dynamic import

tests/cases/fourslash/findAllReferencesDynamicImport1.ts

@@ -0,0 +1,9 @@
+/// <reference path='fourslash.ts' />
+
+// @Filename: foo.ts
+//// export function foo() { return "foo"; }
+
+//// import("[|./foo|]")
+//// var x = import("[|./foo|]")
+
+verify.rangesReferenceEachOther();

tests/cases/fourslash/goToDefinitionDynamicImport1.ts

@@ -0,0 +1,10 @@
+/// <reference path='fourslash.ts' />
+
+// @Filename: foo.ts
+//// /*Destination*/export function foo() { return "foo"; }
+
+//// import("./f/*1*/oo")
+//// var x = import("./fo/*2*/o")
+
+verify.goToDefinition("1", "Destination");
+verify.goToDefinition("2", "Destination");