Add UPI support to PyFunc model

[pradithya]

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #

Does this PR introduce a user-facing change?:

Checklist

• [ ] Added unit test, integration, and/or e2e tests
• [ ] Tested locally
• [ ] Updated documentation
• [ ] Update Swagger spec if the PR introduce API changes
• [ ] Regenerated Golang and Python client if the PR introduce API changes