Enhancement Proposal (Provisional): Control Plane Dynamic Config (#927)

New proposal document for dynamically configuration NKG control plane.

Author: sjberman

docs/proposals/control-plane-config.md

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+# Enhancement Proposal-928: Control Plane Dynamic Configuration
+
+- Issue: https://github.com/nginxinc/nginx-kubernetes-gateway/issues/928
+- Status: Provisional
+
+## Summary
+
+This proposal contains the design for how to dynamically configure the NGINX Kubernetes Gateway (NKG) control plane.
+Through the use of a Custom Resource Definition (CRD), we'll be able to configure fields such as log level or
+telemetry at runtime.
+
+## Goals
+
+Define a CRD to dynamically configure mutable options for the NKG control plane. The only initial configurable
+option that we will support is log level.
+
+## Non-Goals
+
+This proposal is *not* defining a way to dynamically configure the data plane.