[GSPH] migrate merged_xyzh and merged_patchdata_ghost to solvergraph#1583

Guo-astro wants to merge 3 commits intoShamrock-code:mainShamrock-code/Shamrock:mainfrom

Guo-astro:gsph-solvergraph-merged-patchdataGuo-astro/shamrock:gsph-solvergraph-merged-patchdataCopy head branch name to clipboard