Furi_hal_rtc: new function (#3294)

* furi_hal_rtc_timestamp_to_datetime added
* hw targets api version sync
* hw targets api version sync, bump
* FuriHal: update rtc docs
* unit tests added

Co-authored-by: hedger <hedger@users.noreply.github.com>
Co-authored-by: Aleksandr Kutuzov <alleteam@gmail.com>

targets/furi_hal_include/furi_hal_rtc.h

@@ -252,13 +252,24 @@ uint32_t furi_hal_rtc_get_pin_fails();
 uint32_t furi_hal_rtc_get_timestamp();
 
 /** Convert DateTime to UNIX timestamp
+ * 
+ * @warning    Mind timezone when perform conversion
  *
- * @param      datetime  The datetime
+ * @param      datetime  The datetime (UTC)
  *
  * @return     UNIX Timestamp in seconds from UNIX epoch start
  */
 uint32_t furi_hal_rtc_datetime_to_timestamp(FuriHalRtcDateTime* datetime);
 
+/** Convert UNIX timestamp to DateTime
+ *
+ * @warning    Mind timezone when perform conversion
+ *
+ * @param[in]  timestamp  UNIX Timestamp in seconds from UNIX epoch start
+ * @param[out] datetime   The datetime (UTC)
+ */
+void furi_hal_rtc_timestamp_to_datetime(uint32_t timestamp, FuriHalRtcDateTime* datetime);
+
 /** Gets the number of days in the year according to the Gregorian calendar.
  *
  * @param year Input year.