feat(manager-fallback): Added manager fallback

[VoyTechnology]

This is a functional fallback version of the new heracles architecture. It is designed to full job processing pipeline.

It contains all functionality of the normal manager (after #418), It is however slightly deficient and not as fully featured as the Rust version. The main are:

• There is no support for chunks larger than 64MB
• All progress checking is done using state store and filesystem notifications instead of message acknowledgements

Known issues, possibly originating and related to the old worker rewrite include:

• If a task is send too quickly, the connection to the broker might not yet be established
• If a task fails, it gets restarted indefinatelly
• If a task breaks midway, it might hang the worker

Some of the above issues can be "fixed" by purging the RabbitMQ queue

Note: the logging is commented out in worker due to weird issues on my machine. They are serving informational purpose only and are non essential to the working of the project.

[VoyTechnology]

Merged using admin privileges, without code review, for sprint purposes.

Please see #420 for tracking issue