[cherrypick] [PLUGIN-1897] Wide Record reader fix.#292
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MrRahulSharma
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Currently records from a single batch are being read in a parallel stream processing and the result is being stored in its entirety. This could lead to out of memory(OOM).
The fix is to ensure that the batches are being read with the help of an iterator rather storing the entire result. Made the changes accordingly to SalesforceWideRecordReader.java
Validation has been done by making a query of length more than 20k and ensuring the pipeline passes.
JIRA: https://cdap.atlassian.net/browse/PLUGIN-1897