Dp 701 transaction tasks queue manager

[drEfrati]

Main purpose (bug/feature/enhancement + description)

Finish most of the internals of the payment queue and transaction task queue. Finalize also the public api and fix missing stuff

Technical details

***Still need to add event manager, pending balance and transaction params(will be added in a different branch)

Tests (Unit/Integ)

Documentation (Source/readme.md)