[Tracker] Update C API for Cluster Cost

[tarang-jain]

#1880 adds a new parameter (sample_weight) to the kmeans cluster_cost C++ API. This is a tracker to add the same to the C API (cuvsKMeansClusterCost) when ABI changes are allowed.

[cjnolet]

The way we handle ABI changes now is to create a new function, suffixed by the minor version the function is introduced. In the 02 and 08 release each year, we "compact" and remove the suffix from the function.

[tarang-jain]

I see. I'll just do that in #1880 then