Optimize parcelization protocol in RemoteViews and RemoteCollectionItems

By using "squashing", each ApplicationInfo is only written to the parcel
once. Subsequent writes write only a single int as a reference.

This makes the earlier system with ELIDE_DUPLICATES unnecessary.

Squashing relies on testing for equality, and ApplicationInfo does not
implement equals, therefore I've added a shared cache based on package
name and uid so that we can force all RemoteViews of the same package to
use the same ApplicationInfo object.

There is also a mechanism to update the ApplicationInfo to a new one
(needed for dynamic colors).

This saves space for addView calls as well as RemoteCollectionItems
usage. After this change, each incremental item in a collection adds 48
bytes as a base (before this was multiple kilobytes).

This approach also supports collections with RemoteViews from multiple
packages. Each ApplicationInfo in the entire hierarchy is written at
most once.

Bug: 202831917
Test: locally, atest RemoteViewsTest, atest RemoteViewsFixedCollectionAdapterTest
Change-Id: Ie1b1dc8760247aa771451149243efd63d36da368