SNOW-878116 Add support for PARTITION BY to COPY INTO location

[sfc-gh-lcalderonachio]

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-878116: CopyInto does not support the PARTITION BY clause #430

Co-authored by @azban

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 adds an argument to CopyInto which can be used to specify the PARTITION BY value.

[github-actions]

All contributors have signed the CLA ✍️ ✅
_{Posted by the CLA Assistant Lite bot.}

[sfc-gh-lcalderonachio]

I have read the CLA Document and I hereby sign the CLA

[sfc-gh-ecuberojimenez]

What happens if the actual partition_by_value is an empty string? The actual partition_by will have the value: "PARTITION BY". Is this the expected behaviour? I have the idea that if the partition_by_value is an empty string the partition_by variable should be empty or not taken into consideration when creating copy query command? Is this case even happening?

[sfc-gh-lcalderonachio]

Thanks for the observations here. I have updated the code to make partition_by_value None by default and check if the partition_by should be an empty string or not based on this as well.
Right now, if the partition_by_value variable is None (or empty string), then partition_by will be an empty string, effectively not adding anything related at all to the PARTITION BY to the COPY INTO statement.
The existing test case test_copy_into_location already validates the None case in most of the asserts where they do not have the PARTITION BY clause.

[sfc-gh-lcalderonachio]

I have added an extra test case where the empty string case is being validated 5179d3e

[sfc-gh-jvasquezrojas]

Add this to Unreleased section

[sfc-gh-lcalderonachio]

Thanks. Changed in 300a4fb