Validator log table updates

[rkritika1508]

Which feature or component needs enhancement?
We don't want to populate the validator_log each time a validator has parsed a message. We actually want to give this capability to Kaapi-backend. There will be a flag which if enabled will populate only failed validator logs. Otherwise, we will populate all logs to the validator_log table.

Describe the current behavior
Currently, every validator which is present in input_guardrails or output_guardrails and being used to process user query or LLM output is adding an entry to validator_log table in the database, irrespective of whether the validator has passed successfully or not. This will lead to the validator_log table storing a lot of information which might not be very useful.