Update IDF to e931fe9 and add esp-face (#2291)

* Update IDF to e931fe9 and add esp-face

* Fix PIO builds fail because of sketch size

* Fix example build failing for Arduino

tools/sdk/include/esp-face/fr_flash.h

@@ -0,0 +1,45 @@
+#pragma once
+
+#if __cplusplus
+extern "C"
+{
+#endif
+
+#include "fr_forward.h"
+
+#define FR_FLASH_TYPE   32
+#define FR_FLASH_SUBTYPE   32
+#define FR_FLASH_PARTITION_NAME "fr"
+#define FR_FLASH_INFO_FLAG 12138
+
+	 /**
+     * @brief Produce face id according to the input aligned face, and save it to dest_id and flash.
+     * 
+     * @param l                     Face id list
+     * @param aligned_face          An aligned face
+     * @return -2                   Flash partition not found
+     * @return 0                    Enrollment finish
+     * @return >=1                  The left piece of aligned faces should be input
+     */
+    int8_t enroll_face_id_to_flash(face_id_list *l,
+            dl_matrix3du_t *aligned_face);
+
+    /**
+     * @brief Read the enrolled face IDs from the flash.
+     * 
+     * @param l                     Face id list
+     * @return int8_t               The number of IDs remaining in flash
+     */
+    int8_t read_face_id_from_flash(face_id_list *l);
+
+    /**
+     * @brief Delete the enrolled face IDs in the flash.
+     * 
+     * @param l                     Face id list
+     * @return int8_t               The number of IDs remaining in flash
+     */
+    int8_t delete_face_id_in_flash(face_id_list *l);
+
+#if __cplusplus
+}
+#endif