Improve typo suggestions for list arguments

Decide how to handle list values in typo suggestions:
- Duplicate values may be allowed in some cases but probably not the norm
- Should this exclude values that could result in duplicates?
- Add an option to allow/prevent duplicates for list arguments?

**Location:** `CommandDotNet/Parsing/Typos/TypoSuggestionsMiddleware.cs:74`

**Priority:** Low