Knowledge Base: Support for XML uploads

[AmishaBisht]

Is your feature request related to a problem?
Currently, uploading .xml files to the knowledge base results in an unsupported file type error. This affects users like Avanti Fellows, who need to upload their datasets formatted in XML.

Describe the solution you'd like

• Add support for uploading .xml files to the knowledge base via the upload API.

Original issue

Description
Add support for uploading .xml files to the knowledge base (upload API), OpenAI already supports .xml as a valid file type.
This request is raised by Avanti Fellows, they have their knowledge base in XML format. Adding XML support would allow them to directly upload their datasets.

Current Behavior
Uploading an .xml file results in an unsupported file type error.

Expected Behavior
Users should be able to:

• Upload .xml files directly to knowledge base