[ENG-1513] Better integration between Jobs and processing Actors (#1974)

* First draft on new task system

* Removing save to disk from task system

* Bunch of concurrency issues

* Solving Future impl issue when pausing tasks

* Fix cancel and abort

* Bunch of fixes on pause, suspend, resume, cancel and abort
Also better error handling on task completion for the user

* New capabilities to return an output on a task

* Introducing a simple way to linear backoff on failed steal

* Sample actor where tasks can dispatch more tasks

* Rustfmt

* Steal test to make sure

* Stale deps cleanup

* Removing unused utils

* Initial lib docs

* Docs ok

* Memory cleanup on idle

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Co-authored-by: Vítor Vasconcellos <vasconcellos.dev@gmail.com>
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