add blueprints system and the ability to generate a simple component with a test

[mansona]

So this depends on https://github.com/mansona/layer-gen which is a super janky slim implementation consuming ember-cli/ember-cli#10672 which is built upon ember-cli/ember-cli#10671

Many dominoes to fall before this is going to be ready to merge 🫠 but it is pretty exciting to finally see blueprints working in a blueprint that doesn't actually depend on ember-cli 😱

To try this out you can do the following commands:

pnpm dlx ember-cli@latest new my-super-addon -b "ember-cli/ember-addon-blueprint#blueprints" --pnpm
cd my-super-addon
pnpm generate component best-component-ever
pnpm start

Then if you navigate to http://localhost:4200/tests/ to see your new component being tested 🎉 😱