feat(redshift-driver): introspection for external schemas/tables (e.g. Spectrum) #18627

Job	Run time
latest-tag-sha	20s
build-cubestore	4m 3s
lint	4m 39s
unit (20.x)	6m 46s
build	7m 23s
unit (22.x)	6m 28s
Build & Test :dev for Debian without pushing	17m 37s
integration-smoke (20.x)	11m 15s
integration-cubestore (20.x)	5m 27s
docker-image-latest-set-tag	5s
integration (20.x, clickhouse)	3m 52s
integration (20.x, druid)	4m 0s
integration (20.x, elasticsearch)	3m 23s
integration (20.x, mssql)	3m 59s
integration (20.x, mysql)	6m 29s
integration (20.x, postgres)	4m 0s
integration (20.x, prestodb)	3m 44s
integration (20.x, mysql-aurora-serverless)	3m 16s
integration (20.x, crate)	3m 23s
integration (20.x, mongobi)	3m 49s
	1h 43m 58s

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