Prometheus JMX exporter to debezium/connect image

The default `debezium/connect` image does not contain a Prometheus JMX Exporter Java agent installed and configured. The debezium-examples show how to add and configure that (see: https://github.com/debezium/debezium-examples/tree/main/monitoring/debezium-jmx-exporter).

Use-case:

Having a Prometheus JMX exporter into the debezium/connect image would avoid clients to build, push and maintain custom container images. K8s deployment yaml would look like the following:

containers:
  - name: kafka-connect-server
    image: debezium/connect:1.9 # w/ prometheus jmx exporter built-in
    imagePullPolicy: IfNotPresent

If having Prometheus JMX exporter in the connect image is not preferable, an alternative would be supporting a `debezium/connect-prometheus` image.