SDK / exoplayer

Implement getMediaFormatInteger, a helper method simulating mediaformat.getInteger(name, defaultValue).

This reduces the API 29 restriction from MediaFormatUtil.getColorInfo to API 24, in
particular removing the method-based restriction to a constant-based restriction,
so that we can reduce usage of the API 29 class.

This also allows us to slightly simplify prior use-cases where we'd check
containsKey and getInteger to have a default value.

PiperOrigin-RevId: 511184301