[eglot] Add support for eglot lsp client in emacs

- Update README
- Add eglot-specifics to cc, rs, py, hs
  removing unused lsp-mode packages when eglot is active
- Add eglot-specific bindings
- Add doctor warnings for debugger +lsp and +peek
- Add eglot-backed lookup-handlers
- Add flycheck checker using eglot for :checkers
  syntax users (using flycheck/flycheck#1676 and
  flycheck/flycheck#1592 discussion).
  This implementation is based on @marsam code, and uses recent
  Flycheck development in order to make the code smaller and
  easier to maintain.

modules/tools/debugger/config.el

@@ -89,7 +89,7 @@
 
 
 (use-package! dap-mode
-  :when (featurep! +lsp)
+  :when (and (featurep! +lsp) (not (featurep! :tools lsp +eglot)))
   :hook (dap-mode . dap-tooltip-mode)
   :after lsp-mode
   :demand t