[!] add schema migration support for PostgreSQL sinks, closes #1110 #1111
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admin.migrationtable and migration infrastructure to sinkMigrate()andNeedsMigration()forPostgresWriterandMultiWriterconfig init/upgradecommands to support sink migrationsNewWriterFromPostgresConnnow returns nil writer on errorsMigration pattern follows existing metrics database approach, ensuring both config and sink databases can be upgraded independently using the same
pgwatch config upgradecommand.