feat: turn on parcel2 skeleton

[3cp]

Test with npx makes aurelia/new#parcel.

Skeleton with direct router is outdated since we had made some changes to our router(s). That's another story.

• [x] Basic babel and typescript skeletons.
• [x] ShadowDOM support.
• [x] CSS modules support.
• [x] Unit tests setup.
• [x] E2E tests setup.
• [ ] Router skeleton. Blocked right now due to outdated setup.

[3cp]

Leave router to another time.