media.c2 aidl: Unwrap AHardwareBuffer based handle from existing APIs

Support AHardwareBuffer based handle from existing APIs.
  android::UnwrapNativeCodec2GrallocHandle()
  android::ExtractFormatFromCodec2GrallocHandle()
  android::_UnwrapNativeCodec2GrallocMetadata()

Bug: 321808716
Bug: 321674574
Test: atest android.media.decoder.cts.AdaptivePlaybackTest
Change-Id: I9760e9ca4c0d0178aa8db9542a03c8d6f972a2c0