Change log for SLACK_AUDIT

Date Changes
2025-03-28 Enhancement:
- The Gsub pattern was updated to "\\r\\n" from "\r\n" to fix the problem of "rn" being stripped from the generated output.
- A conversion block was added to explicitly convert the details.type field to a string.
- Mapped "actor.user.id" to "principal.user.userid".
- Mapped "details.url_private" to "target.url".
- Mapped "details.shared_with.channel_id" "target.labels".
- Mapped "details.reason" to "security_result.description".
- Mapped "details.previous_ip_address" to "principal.labels".
- Mapped "details.previous_ua" to "principal.labels".
2023-10-27 Enhancement:
- Mapped "details.reason" to "security_result.description".
2022-08-03 Enhancement:
- Modified mapping for "prin_ip" from "principal.nat_ip" to "principal.ip".
2022-04-07 - Corrected mapping for product_object_id.
- Corrected the user mappings for second log format.