add tud_task_ext(), tuh_task_ext() as exteneded version that take timeout and in_isr

also allow exit tud_task,tuh_task after processing all events for
running other background task for user

src/device/usbd.h

@@ -43,8 +43,17 @@ bool tud_init (uint8_t rhport);
 // Check if device stack is already initialized
 bool tud_inited(void);
 
+// Task function should be called in main/rtos loop, extended version of tud_task()
+// - timeout_ms: millisecond to wait, zero = no wait, 0xFFFFFFFF = wait forever
+// - in_isr: if function is called in ISR
+void tud_task_ext(uint32_t timeout_ms, bool in_isr);
+
 // Task function should be called in main/rtos loop
-void tud_task (void);
+TU_ATTR_ALWAYS_INLINE static inline
+void tud_task (void)
+{
+  tud_task_ext(OSAL_TIMEOUT_WAIT_FOREVER, false);
+}
 
 // Check if there is pending events need proccessing by tud_task()
 bool tud_task_event_ready(void);