SNOW-2012666: Implemented lazy import for pandas in the connector

[sfc-gh-nqi]

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implemented lazy import to pandas for better performance, which will save 400ms for a customer.

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

   Fixes #SNOW-2012666

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.

   Please write a short description of how your code change solves the related issue.

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

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[sfc-gh-nqi]

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