Async: introduce sync executors

Sync executors don't pass Async::Future into the user-provided tasks, but
instead work with return values of the task methods, wrapping them into the
Async::Future internally. Sync tasks are of course possible since forever, but
not the API for those tasks is much cleaner, for users don't have to deal with
"future" in synchronous tasks, for instance when synchronously processing results
of an async task before passing the data to another async task.

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