Add optional password to key authentication

Pedram Navidrequested to merge
add-optional-key-auth into master

Merge Request Checklist

  • Link to an issue
  • Include the proposed fix or feature
  • Include and update tests for the modified code
  • Include a documentation change
  • Add an entry in the Unreleased section of the CHANGELOG

This closes #81 (closed) by making the password for key authentication optional, mirroring the capability in the underlying Snowflake Python client.

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