Use Snowflake connections.toml file #4592

Problem
We would like to directly use the connections.toml file for the Snowflake connector for the Feast Snowflake integration. Setting a connection_name in the feature store configuration file would allow us to use the same connection configuration for the feature store that is also used in other python scripts that access Snowflake.

Currently, the feature store configuration gives the option to add a config_path. To my understanding, this file is a SnowSQL config file which is not directly compatible with the Python Snowflake connector that is used under the hood in Feast.

Proposed Solution
My understanding is, that if the connection_name is passed to the snowflake.connector it will look for the default location of the file and load the configuration parameters for the defined connection. https://docs.snowflake.com/en/developer-guide/python-connector/python-connector-connect#connecting-using-the-connections-toml-file

Thus, adding a field with name connection_name in https://github.com/feast-dev/feast/blob/master/sdk/python/feast/infra/offline_stores/snowflake.py#L79 would work for the offline store. The other Snowflake resources need to be adjusted similarly.

I would be open for a contribution.

Alternatives
A workaround where the connection is configured in an ini file that matches the config in the connections.toml file.