Convert to V2 Addon

[jrjohnson]

Ran pnpx ember-cli@latest addon @ember/render-modifiers -b @embroider/addon-blueprint --pnpm --skip-install --skip-git --typescript --addon-location=ember-render-modifiers and created everything from scratch then copied in modifiers, tests, and the PNPM version setting from ci.yml

Superseeds #66

Todo:

• I'm not a typescript user, I used the typescript blueprint, but I don't know how to move the current types into this code. I'd assume declare them officially in the modifiers, but I don't know how to do that.
• I'm not a release-it user and it doesn't seem to be part of the add-on blueprint anymore, this will need to be configured to work with the ember process.