Add pilot management: create/delete/patch and query#570

Robin-Van-de-Merghel wants to merge 3 commits intoDIRACGrid:mainDIRACGrid/diracx:mainfrom

Robin-Van-de-Merghel:robin-pilot-managementRobin-Van-de-Merghel/diracx:robin-pilot-managementCopy head branch name to clipboard