Storage: tree timestamps (#1971)

* Storage: tree timestamps
* Rpc: add storage timestamp
* Storage: correct timestamp owner
* Storage: update timestamp at sd mount

Co-authored-by: SG <who.just.the.doctor@gmail.com>

firmware/targets/f7/api_symbols.csv

@@ -1,5 +1,5 @@
 entry,status,name,type,params
-Version,+,7.2,,
+Version,+,7.3,,
 Header,+,applications/services/bt/bt_service/bt.h,,
 Header,+,applications/services/cli/cli.h,,
 Header,+,applications/services/cli/cli_vcp.h,,
@@ -1251,6 +1251,7 @@ Function,+,furi_hal_rtc_get_fault_data,uint32_t,
 Function,+,furi_hal_rtc_get_log_level,uint8_t,
 Function,+,furi_hal_rtc_get_pin_fails,uint32_t,
 Function,+,furi_hal_rtc_get_register,uint32_t,FuriHalRtcRegister
+Function,+,furi_hal_rtc_get_timestamp,uint32_t,
 Function,-,furi_hal_rtc_init,void,
 Function,-,furi_hal_rtc_init_early,void,
 Function,+,furi_hal_rtc_is_flag_set,_Bool,FuriHalRtcFlag
@@ -2235,6 +2236,7 @@ Function,+,storage_common_mkdir,FS_Error,"Storage*, const char*"
 Function,+,storage_common_remove,FS_Error,"Storage*, const char*"
 Function,+,storage_common_rename,FS_Error,"Storage*, const char*, const char*"
 Function,+,storage_common_stat,FS_Error,"Storage*, const char*, FileInfo*"
+Function,+,storage_common_timestamp,FS_Error,"Storage*, const char*, uint32_t*"
 Function,+,storage_dir_close,_Bool,File*
 Function,+,storage_dir_open,_Bool,"File*, const char*"
 Function,+,storage_dir_read,_Bool,"File*, FileInfo*, char*, uint16_t"

firmware/targets/f7/furi_hal/furi_hal_rtc.c

@@ -318,6 +318,12 @@ uint32_t furi_hal_rtc_get_pin_fails() {
     return furi_hal_rtc_get_register(FuriHalRtcRegisterPinFails);
 }
 
+uint32_t furi_hal_rtc_get_timestamp() {
+    FuriHalRtcDateTime datetime = {0};
+    furi_hal_rtc_get_datetime(&datetime);
+    return furi_hal_rtc_datetime_to_timestamp(&datetime);
+}
+
 uint32_t furi_hal_rtc_datetime_to_timestamp(FuriHalRtcDateTime* datetime) {
     uint32_t timestamp = 0;
     uint8_t years = 0;