Add initial Glint types

[vlascik]

Adds Glint types.

The types are probably wrong at places, but get the ball rolling and should provide at least some value.

Not sure I will have much time to finish these, so perhaps others could take it from here.

[SergeAstapov]

Hi @romulomachado! Would you be able to look into this?

@romulomachado if you open to add contributors to help with addon maintenance, I'd be open to help

[romulomachado]

Hi @SergeAstapov! I haven't been able to look into this.

Some time ago I reached out to some people in the community to try and transfer this addon to adopted-ember-addons, but that was unsuccessful.

Thanks for reaching out and offering help. I'll add you as a contributor.

[esbanarango]

Hi @SergeAstapov , @romulomachado 👋 .

Were you guys able to coordinate here? It would be great to merge this PR and release a new version 🙏 .

(I can also help to maintain this addon if we need more people here).