[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/lang/haskell/packages.el

@@ -6,6 +6,6 @@
 (when (featurep! +dante)
   (package! dante :pin "4955bc7363")
   (package! attrap :pin "4cf3e4a162"))
-(when (or (featurep! +lsp)
+(when (or (and (featurep! +lsp) (not (featurep! :tools lsp +eglot)))
           (featurep! +ghcide))
   (package! lsp-haskell :pin "582fa27c88"))