Use js_of_ocaml's --enable=effects flag to fix stackoverflows

Motivation and Context

We're facing stackoverflows around LexerLib

Description

This MR uses js_of_ocaml's new --enable=effects flag which turns non tail recursive code to tail recursive CPS (therefore fixing stackoverflows in browser)

Component

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

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Performance improvement (non-breaking change that improves performance)
• None (change with no changelog)

Changelog

Fixes stackoverflows during Lexing in the browser

Checklist:

• Changes follow the existing coding style (use dune @fmt to check).