Partition selection strategies

[tohaowu]

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[dvadym]

On testing:

Please

1. Update this line create_truncated_geometric_partition_strategy -> create_partition_strategy (since we use it now) and please add tests with all strategies
2. Could you please make test_aggregate_private_partition_selection_keep_everything test parameterized with all strategies

[ricardocarvalhods]

Hello, this is related to https://github.com/OpenMined/PipelineDP/issues/281 , right? Is there anything else to implement here?