* [ADF-3723] added first step to adf tree view component
* [ADF-3723] start adding tests for the new component
* [ADF-3723] fixed style and start adding tests
* [ADF-3723] working on unit test
* [ADF-3723] added test for the new tree view component
* [ADF-3723] added event when clicked on a tree node
* [ADF-3723] refactored code
* [ADF-3723 added peer review changes
* [ADF-3723] fixed extra space
* [ADF-3723] fixed unit test
* [ADF-3723] fixed failing unit test
