Undo/Redo for Designer

@mgubaidullin

Add Zundo package
Add undo & redo action buttons to the integration designer
Use zundo to maintain past & future state of integration yaml string
Save/Update yaml string based on undo/redo action
May have to change the property input save to onBlur instead of onChange to avoid character level undo/redo action.

Challenges

Unable undo delete action on array -> raise an issue in zundo (Unable to undo delete operation on array. charkour/zundo#161)
When actions may not focus on the area of change in the designer or in the property slide -> any suggestion on how we can address this?

This one is on hold until we fix performance issues in Designer.

@mgubaidullin

Is there an issue for understanding the performance issue in the designer?
or Can we work on any other item?

Sunbelt Computer Software