Separate TransferHandler and Taskers

Server side

Add 3 interfaces:

PreTasker
PostTasker
ErrorTasker

Responsible to run the respective tasks list. Remove those function from TransferHandler. When the tasks should be run, check if the TransferHandler is a Tasker (Ex: is the TransferHandler a PreTasker at Request validation). If it is then run the tasks. If not pursue transfer.

Edited Mar 23, 2021 by Maxime Robert

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