Add ES6 build to dist

[jer-0]

Is your feature request related to a problem? Please describe.

Hey, ES6 is widely supported these days: https://caniuse.com/?search=es6

Describe the solution you'd like

Seeing that hls.js is written in ES6, it would be great to have an es6 build option.

Additional context

No response

[itsjamie]

How would you want to consume an ES6 build with Web Worker support?

The current build utilizes webpack-webworkify to create a Blob at runtime to create the JS bundle to use in the Worker if you have enableWorker: true any suggestions on how to accomplish this and ship as ESM?

[gkatsev]

Should this issue be closed as a duplicate of #2910?

[robwalch]

Closing as duplicate