feat(extras): blink (#4680)

## Description

Extra to use [blink.cmp](https://github.com/Saghen/blink.cmp) instead of
**nvim-cmp**.

## Todo

- [x] tokyonight suport
- [x] basic integration
- [ ] check / update all cmp sources
- [ ] copilot and others integration 
- [x] native lazydev source

## Limitations

There's no copilot source, so instead when enabling both blink and
copilot:
- blink ghost text is disabled
- copilot suggestions are enabled
- use `<tab>` to navigate snippets and accept copilot completions 

## Related Issue(s)

- https://github.com/LazyVim/LazyVim/discussions/4679

lua/lazyvim/util/cmp.lua

@@ -71,9 +71,17 @@ function M.add_missing_snippet_docs(window)
 end
 
 function M.visible()
+  ---@module 'blink.cmp'
+  local blink = package.loaded["blink.cmp"]
+  if blink then
+    return blink.windows and blink.windows.autocomplete.win:is_open()
+  end
   ---@module 'cmp'
   local cmp = package.loaded["cmp"]
-  return cmp and cmp.core.view:visible()
+  if cmp then
+    return cmp.core.view:visible()
+  end
+  return false
 end
 
 -- This is a better implementation of `cmp.confirm`: