Provide the original MX and Spark on the JS Target

Hello!

I decided to start working on getting Flex 4's Frameworks (MX and Spark) ported to Royale using [OpenFL's Royale Support](https://github.com/openfl/openfl-js?tab=readme-ov-file#actionscript-3-royale) to replace Flash's Playerglobal for the JS Target inspired by https://joshblog.net/2021/adobe-flex-2-running-on-openfl-in-javascript-instead-of-swf/ to allow the full blown libraries to work in royale instead of the incomplete MXRoyale and SparkRoyale libs

I am opening this issue mainly to know if it would it desired that I submit this work to upstream (this repo) once in a working state?

The issue names no files, tests, or concrete entry point. First confirm with maintainers whether a full Flex 4 MX and Spark port using OpenFL's Royale Support is wanted and define the intended upstream scope. Done would require an agreed, working port of the full libraries for Royale's JS target.

Written by the indexing model from the issue text.