Change log for CISCO_UMBRELLA_AUDIT

Date Changes
2024-01-10 Enhancement:
- Added support for DNS type logs.
- Mapped "date_time" to "metadata.event_timestamp".
- Mapped "most_granular_identity", "most_granular_identity_type", "identity_types" and "blocked_categories" to "additional.fields".
- Mapped "internal_ip" and "external_ip" to "principal.ip".
- Mapped "action_type" to "security_result.action_details".
- Mapped "dns_query_type" to "network.dns.questions.type".
- Mapped "dns_response_code" to "network.dns.response_code".
- Mapped "domain" to "network.dns.questions.name".
- Mapped "categories" to "security_result.category_details".
2023-02-28 Newly created parser.