By default, the bot will poll the notifications endpoint every pollingInterval seconds.
This is less resource-intensive than the firehose strategy, but it may take up to pollingInterval
seconds for the bot to receive new events. This strategy will not emit the firehose event.
Firehose: string
The bot will open a websocket connection to the relay and receive events in real-time.
This will consume more bandwidth and CPU than the polling strategy, but the bot will receive
events as soon as they are emitted.