Use the TypeScript compiler for builds

[jonkoops]

• Remove Rollup from the build system and use the TypeScript compiler instead
• Add the 'module' field to package.json for ESM bundling
• Some related config file cleanup

Closes #184

[piotr-cz]

I'd just suggest specifying types is package.json instead of exporting it.
What is the benefit of exporting undefined value from compiled library?

{
  "main": "lib/index.js",
  "module": "es/index.js",
  "types": "lib/types.ts"
}

[jonkoops]

I'd just suggest specifying types is package.json instead of exporting it.
What is the benefit of exporting undefined value from compiled library?

{
  "main": "lib/index.js",
  "module": "es/index.js",
  "types": "lib/types.ts"
}

I am actually curious if we really need to add a types entry to out package file, to my knowledge the TypeScript compiler is smart enough to find the correct file that already exists.

As for the root export { types } I agree this makes no sense. It is however out of scope for this PR to fix this so I have created a new issue (#200).