feat: initial declarative policy GEP

geps/x.md

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+# GEP-X: Declarative Policy
+
+* Issue: TODO
+* Status: Provisional
+
+## Definitions
+
+In this document we'll use `Policy` to refer to things that are specifically called policies
+as well as other "MetaResources" that follow similar patterns.
+
+## TLDR
+
+This proposal is a follow-up to [GEP-713 Metaresources and Policy Attachment][713] to recommend
+that we specifically remove the "attachment" part of "policy attachment" in favor of something
+that is declarative at the affected resource level.
+
+[713]:https://gateway-api.sigs.k8s.io/geps/gep-713/
+
+## Goals
+
+- Remove "attachment" from `Policy` resources and related documentation.
+- Retain `Policy` resource structure other than "attachment" semantics.
+- Provide new semantics to incorporate `Policy` resources at the level of the `Resource` that
+  will be affected.
+
+## Introduction
+
+TODO
+
+## API
+
+TODO: future iteration