Configurable policy definition validation

[wolf4ood]

Feature Request

Currently we validate the JsonObject of the policy definition using the Validator pattern when creating and updating the policy definition. The Validator only validates the structure of the json input.

Recently we introduced a set of API in order to validate and get the execution plan of a given policy within a scope.
#4422

Would be cool to plug the validator optionally when creating and updating the policy definition for a stricter validation
based on the configured PolicyEngine

Which Areas Would Be Affected?

e.g., DPF, CI, build, transfer, etc.

Why Is the Feature Desired?

Are there any requirements?

Solution Proposal

If possible, provide a (brief!) solution proposal.