Support delegation to Rego (Open Policy Agent)

[gengle]

Recommended to support existing policy system Rego.

• Open Policy Agent (go) - https://github.com/open-policy-agent/opa
• Microsoft embedded port (rust)- https://github.com/microsoft/regorus

[cj-formata]

Great suggestion - I could see this being quite helpful, especially in cross-system stof execution.