[Reverted][Experimental] Add icon components

[Windvis]

This adds icon components for each .svg file in the /public/icons folder. We don't register them in the global component namespace, to use them you need to import them in your JS files and pass them through the template context. This a lot more intuitive in the .gjs world, but it still works in loose-mode as well, but it is more verbose.

This PR isn't very useful by itself, but together with #481 it can be used to replace the string based icon setup.

Warning

This setup is still in an experimental state. We want to try it out in a couple of specific places before considering this ready to use by all the Appuniversum users. We might still break the setup in future minor versions until we announce it as stable.

Usage examples

(These examples assume #481 is merged)

Polaris

// some-delete-button.gjs
import { BinIcon } from '@appuniversum/ember-appuniversum/components/icons/bin';
import AuButton from '@appuniversum/ember-appuniversum/components/au-button';

<template>
  <AuButton
    @icon={{BinIcon}}
    @alert={{true}}
  >
    Delete something
  </AuButton>
</template>

Octane

// some-delete-button.js
import { BinIcon } from '@appuniversum/ember-appuniversum/components/icons/bin';
import Component from '@glimmer/component';

export default class SomeDeleteButton extends Component {
  BinIcon = BinIcon;
}

{{! some-delete-button.hbs}}
<AuButton
  @icon={{this.BinIcon}}
  @alert={{true}}
>
  Delete something
</AuButton>

Part of the solution for #482

[piemonkey]

Since the interface is static, this could live separately and be imported into each file, which would simplify the generated file slightly.

[Windvis]

Yea, but since all the files are generated it feels a bit strange to store a common type file somewhere, from which they would import. I don't really see an added value, other than DRYing up the generated code a tiny bit, but we would edit the generation script if we would want to make changes anyways, so no real benefit there either. I would prefer to keep it like this for simplicity sake.

I can poke at it if you want. Where would you put the type? We don't really have a "shared" type file in the project yet, AFAIK.

[piemonkey]

It was just a similar strange feeling with generating something that is static, but I don't see a strong reason to pick one feeling over the other.

[Windvis]

I forgot to squash merge.. my bad..

[Windvis]

Reverted this change and reopened as #487