When you install Aiflow with an extra, the required provider packages should be installed automatically.

For example:

`pip instal apache-airflow[google]` should install apache-airlfow-providers-google package.
setup.py
'facebook': facebook,
    'gcp': google,  
    'gcp_api': google,  
    'github_enterprise': flask_oauth,
    'google': google,
    'google_auth': flask_oauth,
    'grpc': grpc,
    'hashicorp': hashicorp,
    'hdfs': hdfs,  
    'hive': hive,  
    'jdbc': jdbc,
    'jira': jira,
    'kerberos': kerberos,
    'kubernetes': kubernetes,  
    'ldap': ldap,
    "microsoft.azure": azure,
    "microsoft.mssql": mssql,
    "microsoft.winrm": winrm,
    'mongo': mongo,
    'mssql': mssql,  
    'mysql': mysql,
    'odbc': odbc,
    'oracle': oracle,
    'pagerduty': pagerduty,
    'papermill': papermill,
    'password': password,
    'pinot': pinot,  
    'plexus': plexus,
    'postgres': postgres,
    'presto': presto,