Add Proto for ProcState events

[parthsane]

This change introduces a new proto message, AndroidProcState, for perfetto tracing of process state.

This will help understand memory usage.

[github-actions]

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[LalitMaganti]

This is an ultra generic name. Please make this more specific. At the very least adding an android prefix but I would consider making this even more specific (because it's some sort of aggregate counter not actually an event on every proc state).

Also why are we even having this proto at all? IMO this should be a set of CounterTrack track events which is going to be both far more efficient and will remove the need to do de-interning in the trace processor.

[parthsane]

I wasn't sure if this was the correct way to do this, or if this was necessary to do.

I have implemented this as a counter track in the code. If this is a counter track, then does it not need this proto change? I can close the PR then.

[LalitMaganti]

If you can do it with Counter tracks, you should. @zezeozue had exactly this convo in #4795 but the opposite was reached because it wasn't possible to emit in one shot.