Runtime apply overlay by ThemeOverlayManager

a.Runtime overlay package should not be static
  since it's unable to FOTA upgrade
b.Implement ThemeOverlayManager to manage overlay packages

Test: atest testOverlayPackagesForDocumentsUI_shouldBeNonStatic
      can ensure installed RRO for Docsui is Non-Static
Test: atest DocumentsUIGoogleTests
Test: atest OverlayableTest
Test: manual check UI visual

Fixes: 123734953
Bug: 131331107

Change-Id: Iafbf27cad03e7fcc38027b68e80a76947447499d