Add type imports (to avoid disabled import elision)

[PadreSVK]

Motivation

When using in codebase with preserveValueImports and isolatedModules is required to use type only import. For more info see:

• https://devblogs.microsoft.com/typescript/announcing-typescript-4-5-beta/#preserve-value-imports
• https://www.typescriptlang.org/docs/handbook/release-notes/typescript-4-5.html#disabling-import-elision

Checklist

• [ ] Code follows coding conventions held in this repo
• [ ] Automated tests have been added
• [ ] Tests are passing
• [X] Docs have been updated (if applicable)
• [ ] Temporary settings (e.g. variables used during development and testing) have been reverted to defaults

How to test

If manual testing is required, what are the steps? no