Adds a js_of_ocaml setup with Dune and a PoC IDE to demo the bundle

Motivation and Context

Be able to run Ligo compiler completely inside the browser

Description

This MR adds a js_of_ocaml setup with Dune and a PoC IDE to demo the bundle

Component

• compiler
• website
• webide
• vscode-plugin
• debugger

Types of changes

• None (change with no changelog)

Changelog

Checklist:

• Changes follow the existing coding style (use dune @fmt to check).
• Tests for the changes have been added (for bug fixes / feature).
• Documentation has been updated.
• Changelog description has been added (if appropriate).
• Start titles under ## Changelog section with #### (if appropriate).
• There is no image or uploaded file in changelog