SNOW-2119489: Add support for interval types in json format

[sfc-gh-nkumar]

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-2119489

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 a new telemetry message
   • I am modifying authorization mechanisms
   • I am adding new credentials
   • I am modifying OCSP code
   • I am adding a new dependency

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

This PR adds support for INTERVAL YEAR MONTH and INTERVAL DAY TIME to the python connector in JSON format.

Implementation details:

For year-month interval we receive number of months as integer (represented as string) from server. Python timedelta only supports days, seconds and microseconds so this is mapped to ANSI formatted interval string. In numpy it is mapped to numpy.timedelta64.
For day-time interval we receive number of nanoseconds as integer (represented as string). We convert this to timedelta and numpy.timedelta64.

4. (Optional) PR for stored-proc connector: