* When --noUnusedLocals/--noUnusedParameters is disabled, add suggestions instead of errors
* Improve performance: do not add unused suggestion diagnostics unless asking for a suggestion
* Add "unused" flag to diagnostics
* Code review
* reportsUnused -> reportsUnnecessary
* Fix test
* Convert 'installTypesForPackge' refactor to a suggestion
* Have checker collect a list of suggestion diagnostics instead of redoing work in calculateSuggestionDiagnostics
* Add comment
* Add diagnostic even with `--allowJs`