### Add data type for abstract statistics

Our cluster score is a weighted sum of certain sums and standard deviations of node characteristics. When placing a single instance, the cluster score of a big number of quite similar clusters are computed: that of the original cluster with one instance added, for each possible placement. To speed up these computations, add an abstract type of statistics that allows a potentially more efficient update of a single value. Signed-off-by: Klaus Aehlig <aehlig@google.com> Reviewed-by: Petr Pudlak <pudlak@google.com>

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