[SPARK-4537][Streaming] Expand StreamingSource to add more metrics

Add `processingDelay`, `schedulingDelay` and `totalDelay` for the last completed batch. Add `lastReceivedBatchRecords` and `totalReceivedBatchRecords` to the received records counting.
Aha, you're right, so it is hard to collect the total batch records without modifying the `StreamingJobProgressListener` code.