Change CDCRecordStream TableSchemaChanges from channel to slice #1135
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Simpler alternative to #1134
Particularly convenient having exclusion info already transformed into maps/sets in pull connector
Idea is that
CDCRecordStreamis a synchronization object. WhileRecordsis open everything is written to only by pull connector, we only receive records out Records channel. Pull connector relieves write access onceRecordsclosed, allowing everything else to read out the rest. In this regardlastCheckpointSetis unnecessary & I eventually intend to get rid of it