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
"apache.hdfs": hdfs,
    "apache.hive": hive,
    "apache.kylin": kylin,
    "apache.livy": [],
    "apache.pig": [],
    "apache.pinot": pinot,
    "apache.spark": spark,
    "apache.sqoop": [],
    "celery": celery,
    "cloudant": cloudant,
    "cncf.kubernetes": kubernetes,
    "databricks": databricks,
    "datadog": datadog,
    "dingding": [],
    "discord": [],
    "docker": docker,
    "elasticsearch": [],
    "exasol": exasol,
    "facebook": facebook,
    "ftp": [],
    "google": google,
    "grpc": grpc,
    "hashicorp": hashicorp,
    "http": [],
    "imap": [],
    "jdbc": jdbc,
    "jenkins": jenkins,
    "jira": jira,
    "microsoft.azure": azure,
    "microsoft.mssql": mssql,