Deprecate and remove "nested" schemas for pubsub tables
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dsl
improvement
P3
sql
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Description
Context: https://lists.apache.org/thread.html/bf4c37f21bda194d7f8c40f6e7b9a776262415755cc1658412af3c76%40%3Cdev.beam.apache.org%3E
Currently we support two styles of schema in pubsub table definitions, a new "flattened" schema, as well as the original "nested" schema. The flattened style is preferred, but it currently provides no way to read or write pubsub message attributes, so switching over to it completely would be a regression.
When flattened schemas support mapping to attributes, we should remove the nested style.
Imported from Jira [BEAM-9210](https://issues.apache.org/jira/browse/BEAM-9210). Original Jira may contain additional context.
Reported by: bhulette.
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