private static String asString(ApplicationClusterEndpoint.AuthMethod authMethod) {
        return switch (authMethod) {
            case mtls -> "mtls";
            case token -> "token";
        };
    }
Contains all methods for de-/serializing ContainerEndpoints to/from JSON.
Also supports de-/serializing lists of these values.

@author ogronnesby
configserver/src/main/java/com/yahoo/vespa/config/server/tenant/ContainerEndpointSerializer.java