'Upload BYOM files' method from python SDK

[tomhuds]

e.g.

def upload_byom(model_name: str, model_file: str, requirements_file: str)
Will require an update to our byom upload endpoint

[ea-rus]

byom upload creates the new ml engine

Maybe is better to:

byom_engine = con.ml_engines.create_byom(model_code: str, requirements_code: str)

or

byom_engine = con.ml_engines.create_byom(path_to_model_code: str, path_to_model_requirements: str)

Also we can try to implement option to extract code and requirements from module

byom_engine = con.ml_engines.create_byom(<imported python module or class>)