esp_timer: Add an option to skip unhandled events for periodic timers

- Added an option to skip unhandled events for periodic timers. Useful for light sleep.
- Added doc about this case
- Added Test a latency between a call of callback and real event (14-16us). and UT to check skip_unhandled_events.
- Fixed for esp_timer_dump() if name of timer is NULL
- Refactored timer_process_alarm()
- Added the delete function after using in UTs

components/esp_timer/include/esp_timer.h

@@ -41,6 +41,7 @@
 
 #include <stdint.h>
 #include <stdio.h>
+#include <stdbool.h>
 #include "esp_err.h"
 
 #ifdef __cplusplus
@@ -81,6 +82,7 @@ typedef struct {
     void* arg;                      //!< Argument to pass to the callback
     esp_timer_dispatch_t dispatch_method;   //!< Call the callback from task or from ISR
     const char* name;               //!< Timer name, used in esp_timer_dump function
+    bool skip_unhandled_events;     //!< Skip unhandled events for periodic timers
 } esp_timer_create_args_t;
 
 /**