This is a frequently requested feature. The permission is 'paper.antixray.bypass'.
Mojang fixed it in MC-63720
This reverts commit e38eceb42a.
e38eceb42a
Upstream has released updates that appears to apply and compile correctly. This update has not been tested by PaperMC and as with ANY update, please do your own testing Spigot Changes: a19903d2 SPIGOT-520: Add option to disable player data saving