Support for the ParentImage Field!
* The pipeline and backend now support the argument `transform_parent_image` (bool, defaults to True)
* If set, this will map the `ParentImage` Sysmon field to `InitiatingProcessParentFileName` M365 field, and extract the parent process name from the full path as the value for all supported rule categories *except* process_creation.
* This is because the Microsoft 365 Defender table schema does not have a InitiatingProcessParentFolderPath field where the entire path can be used. Previously, having the ParentImage field in a rule would cause an invalid field error for non-process_creation rules.
* For usage and more information, see [the README](https://github.com/AttackIQ/pySigma-backend-microsoft365defender/blob/main/README.md#pipeline--backend-args-new-in-020)