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DB Pipes: Docs on sync control, resync, initial load and more #4037

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Summary

This PR adds more documentation around DB pipes

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@Amogh-Bharadwaj Amogh-Bharadwaj requested review from a team as code owners July 7, 2025 20:34
@Amogh-Bharadwaj Amogh-Bharadwaj requested a review from mshustov July 7, 2025 20:34
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### Monitoring parallel snapshot in Postgres {#monitoring-parallel-snapshot-in-postgres}
You can analyze **pg_stat_activity** to see the parallel snapshot in action. The ClickPipe will create multiple connections to the source database, each reading a different partition of the source table. If you see **FETCH** queries with different CTID ranges, it means that the ClickPipe is reading the source tables. You can also see the COUNT(*) and the partitioning query in here.

### Limitations {#limitations}
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Call out compressed hypertables here mayhaps?

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Could you share what to add exactly ? As I don't have context

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