SNOW-925990 add logging for mapping resultset columns

[sfc-gh-dszmolka]

Description

• This is a very small logging change required earlier by Support, for having some insight into the event of mapping resultset columns.
• Requirements and performance test on tw676.

Checklist

• Format code according to the existing code style (run npm run lint:check -- CHANGED_FILES and fix problems in changed code)
• Create tests which fail without the change (if possible)
• Make all tests (unit and integration) pass (npm run test:unit and npm run test:integration)
• Extend the README / documentation and ensure is properly displayed (if necessary)
• Provide JIRA issue id (if possible) or GitHub issue id in commit message

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (46c2fa8) 87.39% compared to head (75c35d9) 87.13%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #715      +/-   ##
==========================================
- Coverage   87.39%   87.13%   -0.26%     
==========================================
  Files          61       61              
  Lines        5791     5793       +2     
==========================================
- Hits         5061     5048      -13     
- Misses        730      745      +15     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[sfc-gh-pmotacki]

LGTM