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/plugins/extras/coding/copilot.lua

@@ -80,4 +80,44 @@ return {
       })
     end,
   },
+
+  {
+    "saghen/blink.cmp",
+    optional = true,
+    specs = {
+      {
+        "zbirenbaum/copilot.lua",
+        event = "InsertEnter",
+        opts = {
+          suggestion = {
+            enabled = true,
+            auto_trigger = true,
+            keymap = { accept = false },
+          },
+        },
+      },
+    },
+    opts = {
+      windows = {
+        ghost_text = {
+          enabled = false,
+        },
+      },
+      keymap = {
+        ["<Tab>"] = {
+          function(cmp)
+            if cmp.is_in_snippet() then
+              return cmp.accept()
+            elseif require("copilot.suggestion").is_visible() then
+              require("copilot.suggestion").accept()
+            else
+              return cmp.select_and_accept()
+            end
+          end,
+          "snippet_forward",
+          "fallback",
+        },
+      },
+    },
+  },
 }