Environment variable to force browser-based auth

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1. What GitHub issue is this PR addressing? Make sure that there is an accompanying issue to your PR.

   Addresses SNOW-2341451: externalbrowser support for headless environments #2537 and partially SNOW-862000: Support for External Authentication while running from EMR using spark-magic #1637. It's not the optimal solution IMO (as it still requires a port-forward / network access), but is minimally invasive.

2. Fill out the following pre-review checklist:

   • I am adding a new automated test(s) to verify correctness of my new code
   • I am adding new logging messages
   • I am adding a new telemetry message
   • I am modifying authorization mechanisms
   • I am adding new credentials
   • I am modifying OCSP code
   • I am adding a new dependency

3. Please describe how your code solves the related issue.

An interactive console isn't always available, and we can't open a browser from inside docker. However, if the SNOWFLAKE_AUTH_FORCE_SERVER is set, we'll ignore browser-open failures, and listen for the token anyways.

I tested it on a Airflow docker instance running on my laptop and was able to execute queries. Used the following env vars:

SF_AUTH_SOCKET_PORT: '9067' # so we know which port to forward from host to container
SNOWFLAKE_AUTH_FORCE_SERVER: 'true' # to force the server to listen, even without a browser
SF_AUTH_SOCKET_ADDR: '0.0.0.0' # to allow connections from outside the container

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