Copying out AlertController and its relevant resources

To remove dependency of PackageInstaller package on the internal
AlertController, we are copying out all classes, style, drawables
etc from the internal/ directory into packageinstaller/, to make the
AlertController functional as is

Subsequent change will remove the resources not required by the
PackageInstaller in order to make the AlertController work.

Test: Manual UI testing.
Bug: 241139604
Change-Id: Ifdb46c37379911a40b5bcf34c13f0c7be35abcfe