Description

Allows passing custom column definitions when generating SQL. For Databricks
SQL, the xsd:dateTime type is now always mapped to Databricks TIMESTAMP.

Fixes #587

Type of change

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• New feature (non-breaking change which adds functionality)

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works

Additional notes:

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