[DISCUSS] Module structure for the project

[Tim Brown <ti...@gmail.com>]

Hello Apache XTable (Incubating) Community,

I have created a proposal for how we can restructure the project to allow
users to only import the dependencies that they need for their use case.
This will prevent bloat for our users and be increasingly important as we
expand the surface area of XTable.

The proposal contains details on how to restructure the existing modules
and also includes a proposal on how to shade these new modules to avoid
runtime conflicts for users.

Please take a look at the proposal and add comments there:
https://github.com/apache/incubator-xtable/pull/612

Thanks,
Tim