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
'oauthlib!=2.0.3,!=2.0.4,!=2.0.5,<3.0.0,>=1.1.2',
    'requests-oauthlib==1.1.0',
]
google = [
    'PyOpenSSL',
    'google-ads>=4.0.0',
    'google-api-python-client>=1.6.0,<2.0.0',
    'google-auth>=1.0.0,<2.0.0',
    'google-auth-httplib2>=0.0.1',
    'google-cloud-automl>=0.4.0,<2.0.0',
    'google-cloud-bigquery-datatransfer>=0.4.0,<2.0.0',
    'google-cloud-bigtable>=1.0.0,<2.0.0',
    'google-cloud-container>=0.1.1,<2.0.0',
    'google-cloud-datacatalog>=0.5.0, <0.8',  
    'google-cloud-dataproc>=1.0.1,<2.0.0',
    'google-cloud-dlp>=0.11.0,<2.0.0',
    'google-cloud-kms>=1.2.1,<2.0.0',
    'google-cloud-language>=1.1.1,<2.0.0',
    'google-cloud-logging>=1.14.0,<2.0.0',
    'google-cloud-memcache>=0.2.0',
    'google-cloud-monitoring>=0.34.0,<2.0.0',
    'google-cloud-pubsub>=1.0.0,<2.0.0',
    'google-cloud-redis>=0.3.0,<2.0.0',
    'google-cloud-secret-manager>=0.2.0,<2.0.0',
    'google-cloud-spanner>=1.10.0,<2.0.0',
    'google-cloud-speech>=0.36.3,<2.0.0',
    'google-cloud-storage>=1.16,<2.0.0',
    'google-cloud-tasks>=1.2.1,<2.0.0',
    'google-cloud-texttospeech>=0.4.0,<2.0.0',
    'google-cloud-translate>=1.5.0,<2.0.0',