Change log for JUNIPER_MIST

Date Changes
2024-05-03 Enhancement:
- Mapped "site_id" to "src.asset.asset_id".
- Mapped "site_name" to "src.asset.location.name".
- Mapped "group" to "src.user.group_identifiers".
- Mapped "hostnames" to "principal.hostname" and "principal.asset.hostname".
- Mapped "severity" to "security_result.severity".
- Mapped "type" to "metadata.product_event_type".
- Mapped "org_id" to "principal.asset_id".
- Mapped "id" to "principal.asset.asset_id".
- If "has_principal" is "true" and "has_target" is "false", then set "metadata.event_type" to "USER_UNCATEGORIZED", else set "metadata.event_type" to "GENERIC_EVENT".
2023-02-24 Newly created parser.