Add communicator interface

In merge !227 (merged) a test was added to ParameterTest which needs an instant of the class Communicator. Using the concrete class poses two problems, as the communicator depends on CUDA.

1. ParamterTest needs CUDA to compile, even though it is not necessary for the tests themselves
2. The new test from !227 (merged) fails in the pipeline (e.g. https://git.rz.tu-bs.de/irmb/VirtualFluids_dev/-/jobs/137967)

Adding an interface for the communicator fixes both problems. The new interface is named Communicator, while the concrete class was renamed to MpiCommunicator

Note: As mentioned by Sören, the communicator should be reworked and use the existing code in src/mpi (https://git.rz.tu-bs.de/irmb/VirtualFluids_dev/-/issues/45)

added Bug Tests gpu labels

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• bb5397d5 - Add missing overrides

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changed the description

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• d0729c25 - Add missing overrides

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• d45907c1 - Add even more overrides

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As you are working on the communicator, you could have a look on this #45 (closed)

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• 8151da04 - Remove some clutter from communicator interface
• 5bec67f9 - Adapt python bindings

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requested review from @soe.peters

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• 943ebdb1 - Remove timer from Communicator
• 712f30c2 - Rmove unused gatherNups function and rename sumNups

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resolved all threads

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• 57c25b5f - Remove unused variables

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approved this merge request

mentioned in commit 14f5cf45

merged