feat(duckdb): Support DuckDB table functions

[pittst3r]

This PR adds parser and generator support for DuckDB's table function/macro syntax.

[georgesittas]

Thanks for the PR @pittst3r, left some comments.

[pittst3r]

Thanks for the quick and helpful review @georgesittas. I've updated the PR according to your feedback and added an update to the databricks generator that wraps a exp.Select node in a exp.Return node if needed.

I don't have a databricks account so I didn't try it, but in looking at their docs and referencing a similar test in test_databricks.py, it seems like this updated test is correct. To clarify, I'm not seeking to make any updates to databricks code here specifically, but thought it best to ensure duckdb -> databricks transpilation of table functions is supported given databricks -> duckdb is. Does including that in this PR make sense?

[georgesittas]

Thanks for the quick turnaround, Robert.