Ember environment

[dfreeman]

#22 comprises a big chunk of the work necessary to support today's Ember idioms, but we additionally need an environment that exposes types that reflect how Ember components (and controllers!) interact with templates.

One question here is what to call this environment. My hope (and expectation) is that strict mode eventually becomes the norm and is widely adopted, as that makes everything glint aims to do much simpler. Given that, @glint/environment-ember would ideally refer to that environment, but that raises the question of what to call the environment that supports today's idioms. @glint/environment-ember-lax? @glint/environment-ember-classic? Or, if strict mode ultimately comes as part of a new edition, then maybe this is @glint/environment-octane?

[chriskrycho]

On the bike-shedding front, I think I'd be inclined toward @glint/environment-ember-loose (loose and strict being the fairly standard names here in JS land).

[dfreeman]

There's still some follow-on work for this (see #36), but the environment package itself now exists and contains appropriate bindings for Glimmer components and Ember components/helpers/modifiers.