Issue #3582179: Add StreamableGuardrailInterface with start/stop regex...

Abhisek Mazumdarrequested to merge
issue/ai-3582179:3582179-add-streaming-aware-guardrails into 1.4.x

Issue #3582179: Add StreamableGuardrailInterface with start/stop regex buffering and register streaming guardrails via GuardrailsEventSubscriber.

Closes #3582179

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