Change log for MCAFEE_MVISION_CASB

Date Changes
2023-06-22 Enhancement:
- Added a code block to handle purely key-value format logs and mapped additional fields.
- Mapped 'MessageSourceAddress' to 'principal.ip'.
- Mapped 'SourceModuleName' to 'additional.fields'.
- Mapped 'SourceModuleType' to 'principal.resource.resource_subtype'.
- Mapped 'actorIdType' to 'principal.user.attribute.roles'.
- Mapped 'informationExternalCollaboratorsCount' tp 'additional.fields'.
2022-07-04