Add a KinesisShardEndedEvent in KclMessageDrivenChannelAdapter

[javarno]

In shardEnded emit a new event (something like a KinesisShardEndedEvent)

[artembilan]

We may consider including some other event types, e.g. KinesisConsumerIdleEvent.

Something similar what we have in Spring Kafka: https://docs.spring.io/spring-kafka/docs/2.2.3.RELEASE/reference/html/_reference.html#events

Of course, we may introduce them on demand...

[artembilan]

Reopen since we can't add support for this type of event until we upgrade to KCL v2.
See #155 for more info.