feat(common): add CommonEngine to encapsulate rendering

[Toxicable]

Supersedes #912

Introduces a new CommonEngine to bring together logic from other ones.
it includes

• No breaking changes.
• No new public apis

Will only be used internally for now

The other engines will migrate to use this at a later point

[CaerusKaru]

LGTM, but let's remember to add docs for this later

[angular-automatic-lock-bot]

This issue has been automatically locked due to inactivity.
Please file a new issue if you are encountering a similar or related problem.

Read more about our automatic conversation locking policy.

_{This action has been performed automatically by a bot.}