Support auth mechanism for kafka in SIEM integration for splunk

[pthalasta]

Is your feature request related to a problem? Please describe.
Current SIEM integration of Kafka export from splunk does not work with Kafka endpoint that has an auth mechanism enabled and may be an issue in sending out data to kafka in some env.

Describe the solution you'd like
As the integration is based on confluent-kafka producer, it supports having authN features from SASL_SSL like GSSAPI and OAUTH. Having configurable parameters to these inputs should help in configuring a producer with auth mechanism enabled.

[github-actions]

This issue has been labeled inactive-30d due to no recent activity in the past 30 days. Please close this issue if no further response or action is needed. Otherwise, please respond with a comment indicating any updates or changes to the original issue and/or confirm this issue still needs to be addressed. This issue will be labeled inactive-90d if there is no activity in the next 60 days.

[github-actions]

This issue has been labeled inactive-90d due to no recent activity in the past 90 days. Please close this issue if no further response or action is needed. Otherwise, please respond with a comment indicating any updates or changes to the original issue and/or confirm this issue still needs to be addressed.