CMR-9776: Resolve linter errors & warnings in common-app-lib; add linting config

[zimzoom]

Overview

What is the feature/fix?

Fix clj-kondo errors and warnings on common-app-lib.

Also added .clj-kondo to codebase, including config file and imported config from clj-rewrite.

What is the Solution?

See above, followed clj-kondo docs. See comments in config.edn file.

What areas of the application does this impact?

Quality control

Checklist

• [x ] I have updated/added unit and integration tests that prove my fix is effective or that my feature works
• [x ] New and existing unit and int tests pass locally and remotely with my changes
• [x ] I have removed unnecessary/dead code and imports in files I have changed
• [x ] I have performed a self-review of my own code
• [x ] I have commented my code, particularly in hard-to-understand areas
• [x ] I have made corresponding changes to the documentation
• [x ] My changes generate no new warnings