Literal Alexa custom slot type value handling

BriefingIntentHandler.java

switch (metric) {
    case "status":
        return buildStatusResponse();
    case "stability":
        return buildStabilityResponse();
    case "growth":
        return buildGrowthResponse();
    case "retention":
        return buildRetentionResponse();
    default:
        // Too bad about those near misses!
        // Return an error response.
        return buildUnknownMetricResponse(metric)
}