Configure PubsubIO with dead-letter topic
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Description
Based on discussion from [PR14971](https://github.com/apache/beam/pull/14971).
Currently, PubsubIO throws a RuntimeException when it can't parse a payload. It would perhaps be helpful if users could configure PubsubIO.Read with a dead-letter topic so that parsing errors instead write to the topic rather than just throw an exception.
Imported from Jira [BEAM-12474](https://issues.apache.org/jira/browse/BEAM-12474). Original Jira may contain additional context.
Reported by: zhoufek.
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