[Trilinos] Switch from Isorropia/Zoltan to Zoltan2/Zoltan

[maxfirmbach]

Description

Currently we use the Zoltan package and it's Epetra wrapper Isorropia from Trilinos as interface to partitioning methods, mostly for distributing things regarding the discretization. Being able to switch to Tpetra means we need to switch to the newer package Zoltan2, which can handle Tpetra data structures.
There might be some slight changes in parameter names, but the overall behavior should not change significantly.

With the switch to Zoltan2, we can deactivate Isorropia, but still need the dependency to Zoltan.

Possible Solution and Definition of Done

Preparation

• Place all partitioning functionality and calls to Isorropia into a dedicated place
  Currently: 4C/src/core/rebalance/src/4C_rebalance_graph_based.{hpp, cpp}
• Is this necessary? Make testing robust regarding parallel partitioning independent of the method used (see [Isorropia] Robustness of some tests regarding parallel partitioning #138)
• Activate Zoltan2 in our Trilinos configure script

Switching

• Write a Zoltan2 interface to replace the 'Isorropia' one (see [Trilinos] Move from Isorropia to Zoltan2 #596)
• Solve possible issues on the way:
  • There's an inconsistency, means the hypergraph partitioning results from Isorropia and Zoltan2 differ slightly (see Zoltan2: Hypergraph partitioning results differ compared to Isorropia trilinos/Trilinos#14010)
• Check if it works correctly by using our current ctest routines and fix things on the way

Further clean-up

• Deactivate Isorropia from our Trilinos configure script

Interested Parties

@mayrmt @isteinbrecher @eulovi @m-frey @dharinib98

[maxfirmbach]

I got the confirmation that results might differ in Isorropia and Zoltan2, thus we should not worry about the exact values of the partitioning.