Add access to JMX metrics to Kafka Connect in DebeziumContainer [DBZ-3094]

Migrated from [DBZ-3094](https://issues.redhat.com/browse/DBZ-3094)

In order to have integration-tests that run connectors in Kafka Connect in the DebeziumContainer with snapshotting we need to be able to wait for snapshotting to be completed. This is not possible with the Kafka Connect API. In the normal tests we have direct access to JMX metrics and we check the status directly.

For DebeziumContainer we need to access the JMX exporter that comes in the Debezium container images and provide hlelper methods inside DebeziumContainer to check and wait for connectors to finish streaming.

Start with the DebeziumContainer integration-test setup and the Debezium container image's JMX exporter. Determine how existing tests access JMX metrics and how connector snapshot and streaming completion are checked. Done means DebeziumContainer exposes helper methods that can check and wait for connectors to finish streaming.

Written by the indexing model from the issue text.