[FEA] Make java test utlities for Lists and nested types user-friendly and less verbose

**Is your feature request related to a problem? Please describe.**
Add test utilities to make complex type testing simpler and readable.

**Describe the solution you'd like**
We need some modifications to fromLists and getList methods in cudf java to auto detect number of elements, assert when numRows and data size may not line up and make `DataType` more palatable in terms of verbosity.