feat: add connection_string() passthrough to ContainerGuard (#229) #370

Job	Run time
Test Suite (macos-latest, stable)	2m 7s
Documentation	34s
Security Audit	15s
Test Suite (windows-latest, stable)	6m 43s
Test Suite (ubuntu-latest, beta)	2m 25s
Docker Integration Tests	4m 3s
Dependency Management	21s
Test Suite (ubuntu-latest, stable)	2m 22s
Minimum Supported Rust Version	1m 1s
	19m 51s

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