Coarse-graining support: Support.Deterministic.CoarseCaccioppoliCutoffProduct

Imported from the Apache-2.0 CoarseGraining development at commit c7ddd76c08ade64fed1b8d2ca51be14dfee8deb4.

Cutoff-product bridge for coarse Caccioppoli

Compatibility wrapper for the cutoff-product subdirectory. The development now lives in HCPolySupport.Deterministic.CoarseCaccioppoli.CutoffProduct.*.