Updated the KeyValueTypes struct used for type-parameterized GTests to use a template template argument so that one doesn't need to specify the type of the aggregation_operator and risk mismatch.
Updated the KeyValueTypes struct used for type-parameterized GTests to use a template template argument so that one doesn't need to specify the type of the aggregation_operator and risk mismatch.

gpuopenanalytics/libgdf,gpuopenanalytics/libgdf,gpuopenanalytics/libgdf,gpuopenanalytics/libgdf