feat: enable external reclaim for mem spillable df operators#21425

nathanb9 wants to merge 2 commits intoapache:mainapache/datafusion:mainfrom

nathanb9:enable-external-operator-reclaim-spill-hooks-for-external-memory-managersnathanb9/datafusion:enable-external-operator-reclaim-spill-hooks-for-external-memory-managersCopy head branch name to clipboard