Add `onRestoreFile` overload that takes a `FullRestoreDataInput` param

The `BackupAgent#onRestoreFile` method takes a number of parameters
related to the file being restored. We need to add some additional
parameters, for example the app version code (which is also passed to
`onRestore`) or transport flags. Rather than adding another overload
with all these additional parameters, we're taking the same approach as
we did with `onFullBackup` and define a new class that contains all
these parameters. This should also help us avoid adding more overloads
in case we want to add another parameter in the future.

This change only introduces the necessary API changes, but the new
parameters are all set to their default values. A follow up change will
modify the IBackupAgent.aidl and pass through the parameters from the
restore engine, which also requires updating non-backup owned code.

Bug: 403956528
Test: atest BackupAgentTest.java
Flag: com.android.server.backup.enable_cross_platform_transfer
API-Coverage-Bug: 430585746

Change-Id: Ic6e6235e782a47d1a6a722e99bc9976fce15fdc4