feature(task): Implement pause, resume and cancel

Use as `pauseTask(taskName)`. They return boolean values to tell the developer if a timed task can be paused/resumed/cancelled properly.
A little bit of testing shows that pausing and then resuming may execute the task multiple times.

src/main/java/emu/grasscutter/task/Task.java

@@ -1,7 +1,5 @@
 package emu.grasscutter.task;
 
-import org.quartz.JobDataMap;
-
 import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;