clangd_plugin : I would say : contrib plugins location ? bring it on :-)
I prefer adding clangd_client into the contribs also.
We can always move it to core later if needed.
AndrewCot has shown me how to do that.
However, I've been waiting for it to run on all platforms for a whole months without a crash or serious bug before adding it to contribs. So far no cigar.
But it's getting cleaner and (mostly) reliable (thanks a lot to the testers).