freertos: update module handles to struct type

This commit updates the handles for the timer, task and event_group
modules to struct type. This matches upstream freertos source.

Signed-off-by: Sudeep Mohanty <sudeep.mohanty@espressif.com>

components/esp_event/host_test/fixtures.hpp

@@ -123,7 +123,7 @@ struct MockMutex : public CMockFix {
 };
 
 struct MockTask : public CMockFix {
-    MockTask (CreateAnd flags) : task((void*) 1)
+    MockTask (CreateAnd flags) : task((TaskHandle_t) 1)
     {
         if (flags == CreateAnd::FAIL) {
             xTaskCreatePinnedToCore_ExpectAnyArgsAndReturn(pdFALSE);