Changes to List inference calls

added the new agent_chat enum value to the inferences/items/endpoint response property for the response status 200

added the enum value agent_chat to the property items/ of the query request parameter endpoint

added the new required query request parameter created_after

added the new required query request parameter created_before

added the pattern ^(created_at|cost_microdollars|latency_ms|endpoint|model|inference_id)( (asc|desc))?$ to the query request parameter order_by

deleted the query request parameter end_date

deleted the query request parameter endpoint_filter

deleted the query request parameter start_date

added the new optional query request parameter endpoint

added the non-success response with the status 422

added the non-success response with the status 500

added the new element_locate enum value to the inferences/items/endpoint response property for the response status 200

endpoint added