feat: add cjs and esm build

[yooouuri]

close #53

This PR will add a cjs and esm build.

Also changed from npm to pnpm.

import { StreamBarcodeReader } from "vue-barcode-reader";
// or
import { ImageBarcodeReader } from 'vue-barcode-reader'

Stylesheet needs to be imported manually

<style lang="scss" scoped>
@import 'vue-barcode-reader/style.css';
</style>