add synchronous (blocking) support for usbh control transfer

- add synchronous version of all get descriptor API
- update bare example to use sync API for string descriptor
- change order of index, language_id in tuh_descriptor_get_string() to
match similar API of libusb
- add index to tuh_descriptor_get_hid_report()

src/common/tusb_types.h

@@ -228,6 +228,8 @@ typedef enum
   XFER_RESULT_SUCCESS,
   XFER_RESULT_FAILED,
   XFER_RESULT_STALLED,
+  XFER_RESULT_TIMEOUT,
+  XFER_RESULT_INVALID
 }xfer_result_t;
 
 enum // TODO remove