docs: Policy engine documentation

[john-fletcher-aot]

Description

High level documentation for policy engine architecture (current)

Fixes # ORV2-2156

Type of change

Please delete options that are not relevant.

• Documentation update

How Has This Been Tested?

N/A

Checklist

• I have read the CONTRIBUTING doc
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works (n/a)
• New and existing unit tests pass locally with my changes
• Any dependent changes have already been accepted and merged

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