Get comment/documentation data from the database

[shohamyamin]

**Is your feature request related to a problem? Please describe. **
The problem is that in order to enter the description for the table and columns it needed to be done manually

Describe the solution you'd like
That I will be able ti tell vanna to scan and get all the documentation out of the database.

Describe alternatives you've considered
Writing a script that export all the comment/documentation and inserting it to Vanna. but I guess that I might not give the full context and then loss information that maybe is relevant.

Additional context
I am new to Vanna so I may have missed this option.
I am using Apache Iceberg and I store the description inside iceberg as part of the table description.

[zainhoda]

This is a good suggestion! It would likely have to be a community contribution. Basically if you do end up writing a script to extract the comments, we can incorporate that into the package somehow.