Implement support for reading Opal card (Sydney, Australia) (#2683)

* Implement support for reading Opal card (Sydney, Australia)
* stub_parser_verify_read: used UNUSED macro
* furi_hal_rtc: expose calendaring as functions
* opal: use bit-packed struct to parse, rather than manually shifting about
* Update f18 api symbols

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

firmware/targets/furi_hal_include/furi_hal_rtc.h

@@ -255,6 +255,30 @@ uint32_t furi_hal_rtc_get_timestamp();
  */
 uint32_t furi_hal_rtc_datetime_to_timestamp(FuriHalRtcDateTime* datetime);
 
+/** Gets the number of days in the year according to the Gregorian calendar.
+ *
+ * @param year Input year.
+ *
+ * @return number of days in `year`.
+ */
+uint16_t furi_hal_rtc_get_days_per_year(uint16_t year);
+
+/** Check if a year a leap year in the Gregorian calendar.
+ *
+ * @param year Input year.
+ *
+ * @return true if `year` is a leap year.
+ */
+bool furi_hal_rtc_is_leap_year(uint16_t year);
+
+/** Get the number of days in the month.
+ *
+ * @param leap_year true to calculate based on leap years
+ * @param month month to check, where 1 = January
+ * @return the number of days in the month
+ */
+uint8_t furi_hal_rtc_get_days_per_month(bool leap_year, uint8_t month);
+
 #ifdef __cplusplus
 }
 #endif