[DO NOT MERGE][ntuple] Use std::string_view consistently in signatures - #22835

[DO NOT MERGE][ntuple] Use std::string_view consistently in signatures #22835

silverweed wants to merge 4 commits into

root-project:masterroot-project/root:masterfrom

silverweed:string_view_signaturessilverweed/root:string_view_signaturesCopy head branch name to clipboard