feat: add support for Redshift connections #4600

Job	Run time
Smoke test: stock R	4m 54s
Collect suggests deps	9s
Collect versions	8s
Check suggests deps	0s
ubuntu-22.04 (release)	6m 51s
macos-latest (4.4)	5m 6s
Without ${{ matrix.package }}	0s
macos-latest (4.3)	3m 54s
pkgdown	8m 43s
windows-latest (devel)	7m 20s
windows-latest (4.4)	6m 44s
windows-latest (4.3)	10m 10s
ubuntu-22.04 (devel)	4m 43s
ubuntu-22.04 (4.4)	4m 25s
ubuntu-22.04 (4.3)	5m 1s
ubuntu-22.04 (4.2)	5m 53s
ubuntu-22.04 (4.1)	4m 27s
ubuntu-22.04 (4.0)	5m 41s
ubuntu-22.04 (4.4) with covr	4m 9s
ubuntu-22.04 (release) SQL Server with covr	4m 54s
ubuntu-22.04 (release) Postgres with covr	4m 28s
ubuntu-22.04 (release) MariaDB with covr	4m 59s
ubuntu-22.04 (release) MySQL with covr	4m 32s
ubuntu-22.04 (release) DuckDB with covr	4m 30s
ubuntu-22.04 (release) SQLite with covr	5m 18s
	1h 56m 59s

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