Update CODEOWNERS file [No hash bump needed]
- Replace David by Volker as central manager
- Add the ci_script folder
- Add the macro folders ans assign to Eoin
- Add the online folder and assign to main creators of online pars
- Add the FSD folder and assign to Radim
- Add Eoin and Ilya as owner of PSD
- Add Martin and Simon as owners or RICH
- Add Mehul as owner of STS