NIFI-10073 Adding fluid load balancing strategy

[simonbence]

NIFI-10073

This is a possible approach to add "fluid" load balancing strategy which among others, tries to split the load between nodes based on the actual processing capacities. Please keep that in mind that this is currently in a DRAFT phase! Thanks!

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[MikeThomsen]

In principle, this looks like it should solve a problem that's vexed my team for a while. We have nodes frequently not getting new data because the current approaches seem to decide to stop sending data to "slower nodes." Am I reading this Jira/PR right?