Add ConfigResolver with necessary tests#641

Merged

ubaskota merged 3 commits intosmithy-lang:config_resolution_mainfrom

ubaskota:config_resolver

Feb 23, 2026

Commits on Feb 20, 2026

Add ConfigResolver with shared singleton pattern
ubaskota
committed

Commits on Feb 21, 2026

Address reviews
ubaskota
committed

Commits on Feb 23, 2026

Remove list copying mechanism in resolver and a test related to it
ubaskota
committed