Add scalajs support

[mprevel]

Hi,

This PR adds scala.js support so the rule engine can be used in the browser or in nodejs context and rules can be shared between these 2 environments.

All modules are available for JVM and JS platforms but erules-cats-xml that remains only for JVM since it would require cats-xml-core to be published for JS platform previously and I neither know if it is possible (no java dependencies, ...) nor useful since JSON is already available via circe and more common in JS environment.

Please let me know if this PR needs extra changes.

Regards,

[geirolz]

Hi @mprevel! Thank you so much for this PR, I'll have a look as soon as possible

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[jarrodcodes]

Definitely want to use this within ScalaJS. What would it take to get this over the finish line?

[jarrodcodes]

Bump on this.

[mprevel]

I don't know. I may work on it if I get info about the changes to do.

[jarrodcodes]

@geirolz any chance we could get some traction on reviewing this?