feat(runtime): Enhance MonitoringStreamsInterceptor to support pluggable reporters

[fhussonnois]

Currently the MonitoringStreamsInterceptor periodically reports the state of Kafka Streams instances directly into a Kafka topic.

In some production contexts, it may be convenient to be able to report these states to third party systems other than Kafka (e.g., DataDog).

This issue proposes to add a new pluggable interface MonitoringReporter that developers can implement to provide custom reporting mechanisms.

Custom implementations will be passed to the interceptor though a new configuration property
monitoring.streams.interceptor.reporters and/or though the AzkarraContext as components.

A default KafkaMonitoringReporter should be implemented to provide the current existing behaviour. In addition,

see #113