SDK / exoplayer

There is an open Gradle bug that dependencies with AARs are not marked
as such in the created POM files (https://github.com/gradle/gradle/issues/3170).

This causes issues building ExoPlayer with Maven POMs only.
(Issue: google/ExoPlayer#8353).

This change adds the workaround suggested on the Gradle bug until
the bug is fixed. As we have a mixture of JAR and AAR dependencies,
we need to maintain a lookup table to know which dependencies have AARs.
The current code throws when a new dependency is added and it's not
classified.

#minor-release

PiperOrigin-RevId: 417797407