Add PackageManager#getInstallSourceInfo() to the API.

Adds a new parcelable class InstallSourceInfo and a method to retrieve
it for a given package.

Also deprecates getInstallerPackageName(), which is subsumed by the
new method.

Bug: 134746019
Test: atest PackageManagerTests
Test: atest CtsContentTestCases
Change-Id: I9e5be29cac15a6bbe1482a6fdefca595418e6e66