No AppStandby tracking of non existent packages and add parole window

Disallow attempts to change standby bucket of nonexistent packages.
Also, add a parole window for idle apps. When parole for idle apps is
ready to be set, check that there is network availabilty. If there is
none, wait for network or the end of the parole window before setting
parole.

Change-Id: I7b8786f59b8da76325f2591cc7b1f86753d52d7b
Fixes: b/71857185
Fixes: b/74345840
Test: atest android.app.usage.cts.UsageStatsTest#testIgnoreNonexistentPackage
Test: manual (enable DEBUG and COMPRESS_TIME in AppStandbyController)