data(.Frame) and protobuf types

[kylebrandt]

When working with protobuf types get generated from the protobuf generated files. However, we will want the data package to provide types that are easy to work with for developing plugins (and for GEL operations.)

@marefr and I talked about this briefly, we are not sure what the best way to do the code here is. We could maybe have Go type for a Frame and assert the protobuf type is of type Frame. Or maybe there are better ways to do this. Not sure at the moment.

We will also want the Frame type to serialize in a defined consistent way over json for the frontend to consume.

Relates to:

• Support sending DataFrames over GRPC Support sending data.(Frame) over backend-plugin GRPC #4

[kylebrandt]

We Believe:

• There is a package for the protobuf types
• And a Go package that wraps those, so developers are not interacting with the Go Types