Mark xds/core CIDR as stable #137
Description
The xds/core/v3/cidr.proto file still carries a work-in-progress annotation, but it has not changed in ~5 years and is widely used in production.
For example, Envoy uses this type in multiple APIs, including the RBAC filter:
https://github.com/envoyproxy/envoy/blob/09603b06b93c4f9278a096ad5beb2780eaf263fe/api/envoy/config/rbac/v3/rbac.proto#L273
Because of the WIP annotation, Envoy emits warnings at startup, even though this type is stable and relied upon by existing deployments.
Given its long-term stability and widespread usage, I propose removing the work-in-progress annotation from cidr.proto to avoid misleading users and unnecessary warnings.