KAFKA-19363: Finalize heterogeneous simple share assignor #20074
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Finalise the share group SimpleAssignor for heterogeneous subscriptions.
The assignor code is much more accurate about the number of partitions
assigned to each member, and the number of members assigned for each
partition. It eliminates the idea of hash-based assignment because that
has been shown to the unhelpful. The revised code is very much more
effective at assigning evenly as the number of members grows and shrinks
over time.
Reviewers: Apoorv Mittal apoorvmittal10@gmail.com