Add ability to customize logging for CSPs

We are experiencing an issue on Google Cloud where all logs are displaying incorrect severity levels; each log entry is marked as ERROR. This appears to be caused by Google Cloud's inability to correctly parse the logs.

As I can see, the format of the logs is configured in the core code here:

https://community.opengroup.org/osdu/platform/domain-data-mgmt-services/rock-and-fluid-sample/rafs-ddms-services/-/blob/main/app/core/settings/app.py#L92

It would be great to add the capability to create a CSP-specific log handler, similar to the implementation for CSP blob storages.