Add viewer support for database connections in Variables Pane #1361

Job	Run time
Test Windows / Rust: stable, R: release, Arch: x64	13m 23s
Test Windows / Rust: stable, R: release, Arch: arm64	29m 37s
Test macOS / Rust: nightly, R: release, OS: macos-latest	5m 28s
Test macOS / Rust: stable, R: 4.2, OS: macos-14	6m 46s
Test Linux / Rust: stable, R: 4.2	7m 30s
Test Linux / Rust: stable, R: release	7m 40s
Test Linux / Rust: nightly, R: release	7m 32s
	1h 17m 56s

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