UEFI: add support for tasks scheduler and make it default (#5553)

* add support for UEFI time and UEFI events; fix STOP \n -> \r\n conversion

* make it so both scheduler=none and scheduler=tasks works

* address pr comments
  - Renamed/shared the amd64 Win64 ABI task stack Go file for both Windows and UEFI.
  - Deleted the duplicate UEFI task stack Go file and old Windows-suffixed Go file.
  - Added task_stack_amd64_windows.S unconditionally to targets/uefi-amd64.json.
  - Removed the UEFI ExtraFiles() special case from compileopts/config.go.
  - Added a scheduler.none tinygo_task_exit stub.
  - Removed the custom UEFI sleep override so normal scheduler sleep queue is used.

* revert back to simpler return value for ExtraFiles()

* create uefi specific tasks_none file

* remove unused sleepSchedulerCustom stuff

* add back the uefi tag

* lib: restore macos-minimal-sdk pointer

src/runtime/scheduler_cooperative.go

@@ -297,10 +297,6 @@ func sleep(duration int64) {
 	if duration <= 0 {
 		return
 	}
-	if schedulerSleepCustom(duration) {
-		return
-	}
-
 	addSleepTask(task.Current(), nanosecondsToTicks(duration))
 	task.Pause()
 }

src/runtime/sleep_custom_default.go

@@ -1,7 +0,0 @@
-//go:build !(scheduler.tasks && uefi)
-
-package runtime
-
-func schedulerSleepCustom(duration int64) bool {
-	return false
-}