fix(consumer): Fix consumer handling of TOAST columns

Arun Sorirequested to merge
arun/fix-toast-handling into main

What does this MR do?

  • Fixes TOAST handling of array values and further simplifies the logic
  • Rationale: TOAST marked values will always be nil in the stream so just replace them by fetched ones instead of using COALESCE.

How do I test it?

  • There is a new test added to verify the behavior for arrays

Related to #182 (closed)

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