Support Python 3.10 union syntax in UDF

[mknapik]

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 https://github.com/snowflakedb/snowpark-python/issues/1302

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 adding new credentials
   • [ ] I am adding a new dependency

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

   str | None should be equivalent to Optional[str]. Add additional type check for types.UnionType.

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[mknapik]

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