feat: allow a pipeline to optionally use the FastAPI Request object

[awalker4]

If request is included as a non-default param to pipeline_api, we'll send the active Request object. This will allow a pipeline to, for instance, access headers as needed.

If you'd like to try this:

• Pull this branch

• Active your pyenv for unstructured-api and run make install-project-local

• Switch to unstructured-api and verify that nothing changes when you run make generate-api

• Now, open the pipeline notebook and add request as a param to pipeline_api:

  def pipeline_api(
  file,
  request,
  filename='',
  m_strategy=[],
  m_coordinates=[],
  file_content_type=None,
  response_type="application/json"
  ):

• Regenerate the api and verify that general.py now takes the request param.