feat: runtime provider hotswap (#82)

Add ability to replace a FeedSourceProvider at runtime and propagate
the new source to all active (and pending) user sessions, invalidating
their feed caches.

Co-authored-by: Ona <no-reply@ona.com>

apps/aelis-backend/src/weather/provider.ts

@@ -20,6 +20,7 @@ const weatherConfig = type({
 })
 
 export class WeatherSourceProvider implements FeedSourceProvider {
+	readonly sourceId = "aelis.weather"
 	private readonly db: Database
 	private readonly credentials: WeatherSourceOptions["credentials"]
 	private readonly client: WeatherSourceOptions["client"]