* and stop setting default values in python operator code, so defaults can be set at the server side.

This issue is just for the PR and questions from maintainers. 
setup.py
"""
    Adds extras for all providers.
    By default all providers have the same extra name as provider id, for example
    'apache.hive' extra has 'apache.hive' provider requirement.
    """
    for provider_name, provider_requirement in PROVIDERS_REQUIREMENTS.items():
        EXTRAS_REQUIREMENTS[provider_name] = provider_requirement
def add_additional_extras() -> None: