Need more CLI tools

[pcoccoli]

Is your feature request related to a problem? Please describe.
At a minimum, copy over kestrel/ikestrel CLIs from kestrel 1.x this part is done now, but additional CLI tools would be helpful for debugging and integrations.

Describe the solution you'd like
We need the kestrel CLI, but it would also be nice to have some additional command line tooling. E.g.:

• a way to dump a data source mapping to stdout to make it easier to modify a built-in mapping
• simple query tool: submit just the WHERE part from kestrel and get either native or translated results back
• more translation debugging aids
• create a DB from a known data file formats for use with sqlalchemy interface (for debug and demo purposes)