Migrate to TypeScript

[TatianaFomina]

Problem

This tool was built in JavaScript to be a simplest example of Editor.js Tools API usage. Right now further enhancements requires more modern stack.

Task

We need to migrate this project to TypeScript and provide type declarations. Make sure types for the plugin are available when using it in TypeScript project with Editor.js

[hermesalvesbr]

Do you have plans to migrate the project to use typescript, or has it become inactive?