Auto merge of #131075 - mrkajetanp:bootstrap-editors, r=Kobzol

bootstrap: Consolidate editor setup into ./x setup editor & add support for vim, emacs & helix

Add support for automatically setting up the recommended
LSP config for Vim (coc-nvim), Emacs (eglot) and Helix.

Additionally, refactor setup.rs to make it easier to add support
for more editors in the future.

As suggested,
r? `@jieyouxu`