add tud_hid_descriptor_report_cb()

- remove tud_desc_set.hid_report
- remove tud_desc_set_t

src/class/hid/hid_device.h

@@ -68,6 +68,11 @@ bool tud_hid_mouse_report(uint8_t report_id, uint8_t buttons, int8_t x, int8_t y
 // Callbacks (Weak is optional)
 //--------------------------------------------------------------------+
 
+// Invoked when received GET HID REPORT DESCRIPTOR
+// Application return pointer to descriptor
+// Descriptor contents must exist long enough for transfer to complete
+uint8_t const * tud_hid_descriptor_report_cb(void);
+
 // Invoked when received GET_REPORT control request
 // Application must fill buffer report's content and return its length.
 // Return zero will cause the stack to STALL request