[FL-1958] U2F prototype (#879)

* U2F implementation prototype
* U2F data encryption and store, user confirmation request
* remove debug prints
* fix notification bug in chrome
* split u2f_alloc into u2f_init and u2f_alloc
* typo fix, furi-hal-trng -> furi-hal-random
* rand/srand redefinition
* SubGhz: a little bit of Dante.
* u2f_data naming fix

Co-authored-by: Aleksandr Kutuzov <alleteam@gmail.com>

firmware/targets/furi-hal-include/furi-hal-usb-hid-u2f.h

@@ -0,0 +1,36 @@
+#pragma once
+
+#define HID_U2F_PACKET_LEN 64
+
+typedef enum {
+    HidU2fDisconnected,
+    HidU2fConnected,
+    HidU2fRequest,
+} HidU2fEvent;
+
+typedef void (*HidU2fCallback)(HidU2fEvent ev, void* context);
+
+/** Get HID U2F connection state
+ *
+ * @return      true / false
+ */
+bool furi_hal_hid_u2f_is_connected();
+
+/** Set HID U2F event callback
+ *
+ * @param      cb  callback
+ * @param      ctx  callback context
+ */
+void furi_hal_hid_u2f_set_callback(HidU2fCallback cb, void* ctx);
+
+/** Get received U2F HID packet
+ *
+ */
+uint32_t furi_hal_hid_u2f_get_request(uint8_t* data);
+
+/** Send U2F HID response packet
+ *
+ * @param      data  response data
+ * @param      len  packet length
+ */
+void furi_hal_hid_u2f_send_response(uint8_t* data, uint8_t len);