SNOW-1846847 Add support for autocommit

[sfc-gh-jvasquezrojas]

Please answer these questions before submitting your pull requests. Thanks!

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

   Fixes SNOW-1846847
   Related issue: https://snowflake.discourse.group/t/sqlalchemy-how-to-remove-rollback-statements-for-simple-select-statements/13668

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 new credentials
   • I am adding a new dependency

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

This PR doesn't fix unnecessary emitted rollbacks, instead it add support for setting autocommit isolation level when using engine.connect() funcition.

for example:

 with engine_testaccount.connect().execution_options(
            isolation_level="AUTOCOMMIT"
        );