[Task]: Add MetricsContainer support in the FLIP-27 sources in Flink runner. #25741
Description
What needs to happen?
As a part of #25525. The old MetricsContainer metrics for the Source are removed for Flink streaming jobs and replaced by the metrics specified in FLIP-33.
It is probably worth keeping the old metrics for backwards compatibility. This task should add the metrics that are currently emitted by the UnboundedSourceWrapper to the newly introduced FlinkSource.
Issue Priority
Priority: 2 (default / most normal work should be filed as P2)
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