Protocol buffer definitions for xDS and top-level resource API messages.
//envoy/api/v2:friends enumerates all consumers of the shared
API messages. That includes package envoy.api.v2 itself, which contains several
xDS definitions. Default visibility for all shared definitions should be set to
Additionally, packages envoy.api.v2.core and envoy.api.v2.auth are also
consumed throughout the subpackages of