Create needed methods to display tree view that shows the navigation menu items

• Type: Technical Task
• Status: Closed
• Priority: Minor
• Resolution: Completed
• Affects Version/s: None
• Fix Version/s: 7.4.2 CE GA3, 7.4.13 DXP GA1, Master
• Component/s: Pages > Pages Tree
• Labels:
  • fc_21_06
  • pt-app-security-review
• Git Pull Request: https://github.com/victorg1991/liferay-portal/pull/370

Must provide methods to:

• Complete the page selector with the menus
• Provide items tree of a specific menu
• Implement needed logic to determine which option and menu item the user has selected.
• Incorporate use of a Feature Flag