Enterprise: Needs disable(), enable() and readonly() methods for Tree

[deep7102]

Is your feature request related to a problem? Please describe.
Needs disable(), enable() and readonly() methods for Tree

Describe the solution you'd like
Need to add disable(), enable(), readonly() methods for Tree.
Then add those each one to functional and e2e tests.

While working with functional and e2e tests (#264) found there was no basic functionality support with Tree the one it should cover with each component.

[EdwardCoyle]

Rating as [5] because

• these methods are top-level tree methods that will enable/disable/readonly the entire component
• if individual items on the tree were previously enabled/disabled/readonly before the new global methods are run, there will need to be some method of retaining the state of the original items so the global state can be correctly reverted.

[davidcarlsonberg]

Breaking this down into several issues and closing this issue.

748

749

750

751

752