mediav2 CTS: Group audio and video raw resource attributes into a class

Audio and Video raw resource attributes used by encoder tests are spread
across different member variables. Filename, SampleRate, ChannelCount,
Encoding, Width, Height all are now grouped under a class for easier
access.

Bug: 246685227
Test: atest android.mediav2.cts

Change-Id: Ied383305788e9408178c176f8017c571d286e6f7
8 files changed