Add an option to resolve static paths in javascript

[blighj]

The ManifestStaticFilesStorage will replace import/export statements in javascript, and url() statements in css. But if for example you do dom manipulations in javascript and want to reference a static file you have to roll your own sollution to reference the correct static file. Typically you will call the static command in a template and pass it to javascript as a data attribute or in a script of type=application/json, see this classic stack overflow example

This is a proposal to add a generic django.static function to the javascript namespace, by using the template tag {% include_staticjs %}. This then allows you to use django.static("image.png") in your javascript and it will return the correct path eg, "/static/image.123xyz.png"

This makes it more convenient to use static files in javascript when doing dom manipulations, etc.
It would probably be possible that collectstatic changes the javascript files, instead of using a javascript funciton, but this wouldn't work for development and it seems better to keep them working the same way.

[blighj]

I guess this is similar to RAILS_ASSET_URL as mentioned on this discussion django/new-features#11, but that is not an actual JS function, it is a compiler directive rails/propshaft#207