Eslint plugin: Use @typescript-eslint/no-duplicate-imports in TS projects

[walbo]

Description

Update eslint plugin to use @typescript-eslint/no-duplicate-imports on TypeScript projects. This rule extends the base eslint/no-duplicate-imports rule and adds support for type-only import and export.

See https://github.com/typescript-eslint/typescript-eslint/blob/master/packages/eslint-plugin/docs/rules/no-duplicate-imports.md

This allows importing types and exports from the same package without trowing an error. All files that import types today in Gutenberg adds a // eslint-disable-next-line no-duplicate-imports to avoid it. This PR fixes so these are no longer needed.

How has this been tested?

Locally by running npm run lint-js

Types of changes

Code quality

Checklist:

• My code is tested.
• My code follows the WordPress code style.
• My code follows the accessibility standards.
• I've tested my changes with keyboard and screen readers.
• My code has proper inline documentation.
• I've included developer documentation if appropriate.
• I've updated all React Native files affected by any refactorings/renamings in this PR (please manually search all *.native.js files for terms that need renaming or removal).

[gziolo]

This is a really nice improvement. I'm glad it's finally resolved.

I tested it locally and it works perfectly fine. It still reports an error when you write two import statements that reference the same file when not bringing types.