GEP: Direct Policy Attachment

[youngnick]

Split out of #713.

This GEP covers work to define and implement an example Direct Policy (most likely BackendTLSPolicy, GEP #1897, since that's already existent and is a Direct Policy.)

This includes at a minimum:

• defining what makes a Direct Policy
• suggested patterns for ensuring discoverable status

Graduation criteria will be something like:

• At least one included Direct Policy
• Included Policy must have conformance tests
• Included Policy may be Extended support (and so, optional).

[youngnick]

/kind gep

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