Repo: Scope for async based on limited sharing and structured concurrency.

Base idea:

• Scope cannot borrow data from outside (can share only owned data) → it can be safely leaked
• Is !Unpin → cannot be moved after first poll
• Child tasks have to be fully structured → can't be leaked or dropped and have to be driven to complete to compile.

As of right now i didn't add any panic safety.

Would appreciate if someone could review soundness of unsafe in the repo.

Differences to other async scope crates:
moro / safe-async-scoped - child tasks can run in parallel
async-scoped - does not block the parent thread

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