In the dask meeting today we talked about how we should be extra careful when making changes to the dispatchers. We are planning on adding some rapids folks to a codeowners file so that they get automatically pinged when changes happen in the dispatch functions. I started looking into this just now and realized that we register dispatchers for pandas in several different places. I am proposing bringing those all under one file so that we can more easily notice when we make changes to these functions (and it makes the codeowners bit easier :) ).

I will open PR shortly with the proposed change, but I wanted to throw this idea up in the meantime to see what people think.

@kkraus14 @jakirkham @rjzamora @jrbourbeau