feat: Add shortcode query param for GET /admin/lists

[seakayone]

Pull Request Checklist

Task Description/Number

On GET /admin/lists provide either a projectIri or a projectShortcode.
Return a 404 if a project identifier was provided but the project not found.

PR Type

• build/chore: maintenance tasks (no production code change)
• docs: documentation changes (no production code change)
• feat: represents new features
• fix: represents bug fixes
• perf: performance improvements
• refactor: represents production code refactoring
• test: adding or refactoring tests (no production code change)
• deprecated: Deprecation warning (ideally referencing a migration guide)

Basic requirements for bug fixes and features

• Tests for the changes have been added
• Docs have been added / updated

Does this PR introduce a breaking change?

• Yes