add host/port/protocol as optional profile parameters

[laxjesse]

resolves #21

Description

Adds optional profile parameters that are useful for atypical local connection setups

Checklist

• I have signed the CLA
• I have run this code in development and it appears to resolve the stated issue
• This PR includes tests, or tests are not required/relevant for this PR
• I have updated the CHANGELOG.md and added information about my change to the "dbt-snowflake next" section.

[laxjesse]

I don't think that an integration test is in scope for this since it would require some snowflake configuration as well as a proxy

Also apologies if I updated the changelog incorrectly I can fix if need be

[jtcohen6]

@laxjesse Looks good to me. I agree that an automated integration test for this would be difficult.

Have you been able to test these changes locally, with your proxy setup, and confirm that they're working?

[laxjesse]

Have you been able to test these changes locally, with your proxy setup, and confirm that they're working?

Yes, dbt debug works and I'm able to run an example model (e.g select 1) with our using multiple different combinations of the arguments added

I can't speak to whether or not this will work for all possible set ups but I think this exposes pretty much every argument you can tweak in the snowflake python connector to get a proxy to work without using the environment variables snowflake recommends

[laxjesse]

force pushed to fix some trailing whitespace that was throwing a flake error

[laxjesse]

looks like these test failures were fixed in #37 , rebasing to see if that helps

[jtcohen6]

Thanks for the contribution @laxjesse!