Trino Hook: Add ability to read JWT from file

[jhbigler]

This PR adds the ability to use a file on disk to provide a JWT for the TrinoHook, as opposed to placing the JWT directly into the connection definition. In our use case, we'd like to use a kubernetes projected volume to make JWT's available to airflow. This does not automatically update the connection definition when the token is rotated, however, and it would be easier to simply have airflow read the JWT from disk when using the TrinoHook.

A JWT file is used when the jwt__file parameter is given in the extras section.

[boring-cyborg]

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[uranusjr]

The documentation should also explain what happens if jwt__file and jwt__token are both provided. Also please take at look at the static check failures and correct code formatting.

[jhbigler]

I have implemented the suggested changes, open to additional feedback (@phanikumv @uranusjr @utkarsharma2)

[boring-cyborg]

Awesome work, congrats on your first merged pull request! You are invited to check our Issue Tracker for additional contributions.