Full support for states in the refactored Saga state machine designer

[ptyin]

Why you need it?

Currently, the state machine designer prototype only implements ServiceTask. Other states needs to be supported. All states which to be implemented are listed below,

• ServiceTask
• ScriptTask
• SubStateMachine
• CompensationTrigger
• Choice
• Succeed
• Fail

How it could be?

The implementation can refer to ServiceTask in the new designer.

Other related information

Please merge related PR to the refactor_designer branch.