[TASK] Refactor & clean up templates in many sparse prims

[cjnolet]

There are many places in the sparse prims where templates could be cleaned up (and used). We had originally adopted using int for the row & column arrays in many of the prims because that's what cusparse & scipy were limited to using but we've since started using template types for those in many cuml algorithms (and more recent sparse prims) so it's time those get cleaned up.

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[cjnolet]

Referencing #348

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This issue has been labeled inactive-90d due to no recent activity in the past 90 days. Please close this issue if no further response or action is needed. Otherwise, please respond with a comment indicating any updates or changes to the original issue and/or confirm this issue still needs to be addressed.