Add angleInUse field to 'dumpsys gpu'

Add the angleInUse field to the 'dumpsys gpu' command, which tracks if
ANGLE or the system driver was loaded for each package.

This CL also purges old packages from GpuStats::mAppStats when it fills
up, so GpuStats::mAppStats always contains the most recently launched
apps. This guarantees that `adb shell dumpsys gpu` and bugreports always
contain relevant data if there's an issue.

Bug: b/154955572
Test: adb shell dumpsys gpu
Test: atest CtsAngleIntegrationHostTestCases
Test: atest GpuStatsTest
Change-Id: I0ab96327affefeaebb775aa2ef973131cc823b97