Implements indexing with period identifier style (`foo.bar`)

tests/integration/IndexTests.cpp

@@ -11,4 +11,18 @@ TEST_CASE( "String indexing", "[integration]" ) {
     delete script;
 }
 
+TEST_CASE( "Identifier Index", "[integration]" ) {
+    auto script = Script::Create(uR"(
+foo = {
+    bar = "test"
+}
+return foo.bar
+)");
+    REQUIRE(!script->Diagnostics -> HasErrors());
+    auto result = script->Evaluate();
+    REQUIRE(*result->EvaluateString() == u"test");
+    delete script;
+}
+
+
 #endif