* refactor: migrate to esm - type: module && rename all modules  to cjs
* refactor: migrate to esm - transform to real modules
* build(npm): ⬆ esbuild, indent-string, wrap-ansi
* refactor: migrate to esm - make API slighly more backward compatible & kick out the callback from the API
* refactor: migrate to esm - adds a commonjs build artifact for backwards compatibility

- BREAKING: The (deprecated) callback is gone from the API surface
- BREAKING The minimum required version of node 14 has been bumped (note: those for node 12 & 16 remain the same)