added rag handler param

[martyna-mindsdb]

Description

• added rag handler param
• update readme and docs

Fixes #issue_number

Type of change

• ⚡ New feature (non-breaking change which adds functionality)
• 📄 This change requires a documentation update

Verification Process

To ensure the changes are working as expected:

• Test Location: Specify the URL or path for testing.
• Verification Steps: Outline the steps or queries needed to validate the change. Include any data, configurations, or actions required to reproduce or see the new functionality.

Additional Media:

• I have attached a brief loom video or screenshots showcasing the new functionality or change.

Checklist:

• My code follows the style guidelines(PEP 8) of MindsDB.
• I have appropriately commented on my code, especially in complex areas.
• Necessary documentation updates are either made or tracked in issues.
• Relevant unit and integration tests are updated or added.

[martyna-mindsdb]

@dusvyat
Please have a look.

When testing I get an error after creating the model - ValidationError: 1 validation error for RAGHandlerParameters input_column extra fields not permitted (type=value_error.extra), raised at: C:\Users\Martyna\mindsdb_setup\mindsdb\.\mindsdb\integrations\libs\ml_handler_process\learn_process.py#109

[dusvyat]

@dusvyat Please have a look.

When testing I get an error after creating the model - ValidationError: 1 validation error for RAGHandlerParameters input_column extra fields not permitted (type=value_error.extra), raised at: C:\Users\Martyna\mindsdb_setup\mindsdb\.\mindsdb\integrations\libs\ml_handler_process\learn_process.py#109

As we use pydantic, we need to update the model see here

You would need to add it here too

[martyna-mindsdb]

@dusvyat
Thanks. It fixed this issue.

But now, when querying for predictions, there is another issue:

[dusvyat]

It should be args.input_column

[martyna-mindsdb]

I had it at first. Changing it back.

[martyna-mindsdb]

Ok. Now it works fine. Thanks.

[dusvyat]

lgtm 🚀