Add support for comma-separated URLs

[rayokota]

What

Add support for comma-separated URLs for SR

Checklist

• Contains customer facing changes? Including API/behavior changes
  • Yes
• Did you add sufficient unit test and/or integration test coverage for this PR?
  • Tested manually

References

JIRA:

Test & Review

Open questions / Follow-ups

[confluent-cla-assistant]

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