[FL-3846] Event Loop Timers (#3721)

* Implement POC event loop tmers (not all edge cases are handled)
* Use a separate ready list to allow for (re)starting and stopping of timers from callback
* Improve the test application
* Improve timer API and test application
* Improve timeout calculation logic
* Improve timer API, update documentation
* Fix API usage error
* Update doxygen comments
* Revert the old (correct) check
* Improve function naming
* Check whether a timer was on the expired list before processing it
* Implement tick callback
* Add critical sections to improve timer consistency
* Simplify event loop timer API
* Remove redundant search
* Refactor timer logic, use message queue
* Simplify FuriEventLoopTimer API
* Improve event loop timer logic
* Update the f18 target
* Remove superfluous clears
* Correct f18 api symbols
* Fix doxygen comments
* Update .pvsconfig
* Use a double push list instead of deque
* Update .pvsconfig
* Add pending callback functionality
* Restore unprocessed flags when applicable
* Refactor Dolphin app to use FuriEventLoop
* Improve naming
* Update naming some more
* Fix a typo Co-authored-by: Silent <CookiePLMonster@users.noreply.github.com>
* Fix wait time in example
* Bump API version
* Debug: multiple of 25 timings in event loop blink test
* Separate FuriEventLoopTimer to its own set of files
* Improve start time calculation for periodic timers
* Do not use dynamic allocations for timer requests
* Split the tick functionality in separate files, rearrange code
* Improve timer queue handling
* Properly reset GPIO pins in the test app
* Properly initialise GPIO pins in the test app too
* Furi: variable naming in event loop
* Furi: fix spelling in event loop

Co-authored-by: あく <alleteam@gmail.com>
Co-authored-by: Silent <CookiePLMonster@users.noreply.github.com>

targets/f18/api_symbols.csv

@@ -1,5 +1,5 @@
 entry,status,name,type,params
-Version,+,67.1,,
+Version,+,67.2,,
 Header,+,applications/services/bt/bt_service/bt.h,,
 Header,+,applications/services/bt/bt_service/bt_keys_storage.h,,
 Header,+,applications/services/cli/cli.h,,
@@ -1105,13 +1105,22 @@ Function,+,furi_event_flag_free,void,FuriEventFlag*
 Function,+,furi_event_flag_get,uint32_t,FuriEventFlag*
 Function,+,furi_event_flag_set,uint32_t,"FuriEventFlag*, uint32_t"
 Function,+,furi_event_flag_wait,uint32_t,"FuriEventFlag*, uint32_t, uint32_t, uint32_t"
-Function,-,furi_event_loop_alloc,FuriEventLoop*,
-Function,-,furi_event_loop_free,void,FuriEventLoop*
-Function,-,furi_event_loop_message_queue_subscribe,void,"FuriEventLoop*, FuriMessageQueue*, FuriEventLoopEvent, FuriEventLoopMessageQueueCallback, void*"
-Function,-,furi_event_loop_message_queue_unsubscribe,void,"FuriEventLoop*, FuriMessageQueue*"
-Function,-,furi_event_loop_run,void,FuriEventLoop*
-Function,-,furi_event_loop_stop,void,FuriEventLoop*
-Function,-,furi_event_loop_tick_set,void,"FuriEventLoop*, uint32_t, FuriEventLoopTickCallback, void*"
+Function,+,furi_event_loop_alloc,FuriEventLoop*,
+Function,+,furi_event_loop_free,void,FuriEventLoop*
+Function,+,furi_event_loop_message_queue_subscribe,void,"FuriEventLoop*, FuriMessageQueue*, FuriEventLoopEvent, FuriEventLoopMessageQueueCallback, void*"
+Function,+,furi_event_loop_message_queue_unsubscribe,void,"FuriEventLoop*, FuriMessageQueue*"
+Function,+,furi_event_loop_pend_callback,void,"FuriEventLoop*, FuriEventLoopPendingCallback, void*"
+Function,+,furi_event_loop_run,void,FuriEventLoop*
+Function,+,furi_event_loop_stop,void,FuriEventLoop*
+Function,+,furi_event_loop_tick_set,void,"FuriEventLoop*, uint32_t, FuriEventLoopTickCallback, void*"
+Function,+,furi_event_loop_timer_alloc,FuriEventLoopTimer*,"FuriEventLoop*, FuriEventLoopTimerCallback, FuriEventLoopTimerType, void*"
+Function,+,furi_event_loop_timer_free,void,FuriEventLoopTimer*
+Function,+,furi_event_loop_timer_get_interval,uint32_t,const FuriEventLoopTimer*
+Function,+,furi_event_loop_timer_get_remaining_time,uint32_t,const FuriEventLoopTimer*
+Function,+,furi_event_loop_timer_is_running,_Bool,const FuriEventLoopTimer*
+Function,+,furi_event_loop_timer_restart,void,FuriEventLoopTimer*
+Function,+,furi_event_loop_timer_start,void,"FuriEventLoopTimer*, uint32_t"
+Function,+,furi_event_loop_timer_stop,void,FuriEventLoopTimer*
 Function,+,furi_get_tick,uint32_t,
 Function,+,furi_hal_adc_acquire,FuriHalAdcHandle*,
 Function,+,furi_hal_adc_configure,void,FuriHalAdcHandle*