Add TSV file support to CsvConverter

[shrajal01]

Summary

Adds support for TSV (Tab-Separated Values) files in CsvConverter.

Changes

• Added .tsv to accepted file extensions
• Added text/tab-separated-values MIME type support
• Added TSV delimiter handling (\t)
• Added test coverage and sample TSV test file

Fixes #2022

[shrajal01]

@microsoft-github-policy-service agree

[trippinganymess]

the delimiter should explicitly check both the extension and the MIME type before being intialized.

[trippinganymess]

the accept() function, uses the MIME type and the extension of a file to determine it's type. so In a scenario where a file arrives from a cloud service with no extension, but MIME type would be accepted. but You are currently setting the delimiter by only checking the extension type and not the MIME type. This will cause the function to crash in case a file without an extension is accepted and will automatically default to "," every time.

Example scenario :

1. file received from cloud ( without extension but with MIME type "tab-seperated-values")
2. the accept function allows this file and returns True.
3. delimiter = "\t" if (stream_info.extension or "").lower() == ".tsv" else "," doesn't account for the MIME type and defaults to "," which crashes the whole program.

[trippinganymess]

This also has been addressed in #2021

[shrajal01]

Thanks for the review! Good catch. I'll update the delimiter detection to consider both the file extension and MIME type.