Convert to esm

[Vajahath Ahmed]

• convert the package to esm (no need to learn the algo. lets do that in #2 )
• use typescript: https://github.com/sindresorhus/tsconfig
• use npm (not yarn or pnpm)
• type definitions are available at https://www.npmjs.com/package/@types/floyd-steinberg?activeTab=code (this helps you to understand the api surface)
• setup ut (ask bard/chatgpt) (use avajs)
• setup ci (github actions. remove azure files)