Change log for AWS_CONTROL_TOWER

Date Changes
2024-03-17 Enhancement:
- Mapped "req.userIdentity.arn" and "req.userIdentity.userName" to "target.user.userid".
2023-01-04 Enhancement:
- Initialized variables to avoid replication of data in the For loop.
2022-12-15 Enhancement:
- Mapped 'metadata.vendor_name' to 'AWS'.
- Mapped 'metadata.product_name' to 'AWS Control Tower'.
- Mapped 'metadata.event_type' to 'USER_LOGIN' when 'eventName' is 'ConsoleLogin'.
- Mapped 'security_result.severity' to 'INFORMATIONAL' when 'eventName' is 'ConsoleLogin'.
2022-11-17 Enhancement:
- Mapped 'req.userIdentity.userName' and 'req.userIdentity.sessionContext.sessionIssuer.userName' to 'target.user.id'.
- Mapped 'ConsoleLogin:Success' to 'security_result.action'.
- Mapped port information from 'sourceIPAddress' to 'principal.port'.
2022-10-31 Enhancement: New Parser created.