Allow setting api_version for document intelligence endpoint

[philipp-langen]

Currently it does not seem possible to provide a specific api_version when using document intelligence as an extraction engine. The default is set to "2024-07-31-preview" which is not available in all azure regions.

Potential solution would be adding a new kwarg to MarkItDown

class MarkItDown:
...

  def enable_builtins(self, **kwargs) -> None:
  ...
  
    docintel_api_version = kwargs.get("docintel_api_version")
    if docintel_api_version is not None:
        docintel_args["api_version"] = docintel_api_version
  
    self.register_converter(
        DocumentIntelligenceConverter(**docintel_args),
                  )

Using: markitdown: 0.1.1