Provide state tracing and error handling message

In current implementation, it is hard to know what exactly happened during state transition.

The purpose of this issue is to provide more specific information for state tracing and error tracing.

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Task contains these properties currently

• status => task running status
• state => current state
• transition => the upcoming transition
• content => task content

These properties should be added

• previousState => from which state
• actions => the actions performed during single execution process which will be cleared before running new round execution of the task
  • name => the action name such as onEnter
  • provider => the action provided by which state or transition
  • startTime => action start time
  • endTime => action end time
• errorCause => which problem cause task status being error