Add 4 tabular datasets

[amholler]

Code Pull Requests

Please provide the following:

• a clear explanation of what your code does
• if applicable, a reference to an issue
• a reproducible test for your PR (code, config and data sample)

Documentation Pull Requests

Note that the documentation HTML files are in docs/ while the Markdown sources are in mkdocs/docs.

If you are proposing a modification to the documentation you should change only the Markdown files.

api.md is automatically generated from the docstrings in the code, so if you want to change something in that file, first modify ludwig/api.py docstring, then run mkdocs/code_docs_autogen.py, which will create mkdocs/docs/api.md .

[amholler]

I have tested each of these 4 datasets via example training for concat, tabnet, and transformer models.
I plan to add the associated example training and config scripts to the automl directory under development.

[w4nderlust]

Thank you very much @amholler !