text: Title: Feature: Broker event handlers
  Body: **Is your feature request related to a problem? Please describe.**
  If multiple brokers are used user might need to stop processing messages if depends on other broker,
  
  **Describe the solution you'd like**
  Handle connected/disconnected/reconnected events. Probably, multiple FastStream app instances might be instantiated. As i understand, other brokers that not referred by any FastStream app are not re-connecting automatically in case of network failures or something else. Probably reconnect feature could be enabled for a broker that not referenced by any app.
  
  **Feature code example**
  
  ```python
  from faststream import FastStream
  
  kafka_broker = KafkaBroker(bootstrap_servers= "127.0.0.1:9092")
  
  rabbit_broker = RabbitBroker("amqp://127.0.0.1:5672", virtualhost="/")
  
  @kafka_broker.on_disconnect
  async def kafka_disconnected_cb():
    pass
    
  @rabbit_broker.on_disconnect
  async def rabbit_disconnected_cb():
    pass
  ...
  ```
  ref1: https://github.com/airtai/faststream/issues/526