Add a new type to represent a release of the ink library: ink.proto.Version. Creates new options, so in a future CL we can associate versions with various messages, fields, and enum values in the ink BrushFamily proto.

Add a new type to represent a release of the ink library: ink.proto.Version. Creates new options, so in a future CL we can associate versions with various messages, fields, and enum values in the ink BrushFamily proto. #2731