Update controller protos

[Hackerman342]

No description provided.

[guilhermedemouraa]

Excellent. I may still some ideas for the filter debugging stuff

[mihelich]

We also discussed:

1. Remove FilterTrack.
2. Generally rename Controller stuff to TrackFollower.

It's fine if those are in follow-up PR(s), just want to make sure they don't get lost.

[mihelich]

@Hackerman342 looks great, thanks! I had a couple final comments on enum style. I think there's more we can do in general to set up our gRPC APIs to change gracefully in the future, but I'll leave it there... let's get this in and unblock the feature work.