Add a new narrative forecast module and remove the unimplemented daily forecast stub

internal/module/module.go

@@ -13,6 +13,7 @@ type ID string
 const (
 	Metadata                ID = "metadata"
 	CurrentConditions       ID = "current_conditions"
+	NarrativeForecast       ID = "narrative_forecast"
 	DerivedDailySummary     ID = "derived_daily_summary"
 	DerivedDaypartSummaries ID = "derived_daypart_summaries"
 	PrecipTiming            ID = "precip_timing"
@@ -104,6 +105,7 @@ type FactRequirement string
 
 const (
 	CollectedCurrentConditions      FactRequirement = "collected.current_conditions"
+	CollectedNarrativeForecast      FactRequirement = "collected.narrative_forecast"
 	CollectedAlerts                 FactRequirement = "collected.alerts"
 	CollectedDiscussion             FactRequirement = "collected.discussion"
 	CollectedWeatherStory           FactRequirement = "collected.weather_story"
@@ -127,6 +129,7 @@ const (
 
 type MetadataOptions struct{}
 type CurrentConditionsOptions struct{}
+type NarrativeForecastOptions struct{}
 type DerivedDailySummaryOptions struct{}
 type DerivedDaypartSummariesOptions struct{}
 type PrecipTimingOptions struct{}