feat(extras): added extra for snacks picker (#5368)

## Description

See https://github.com/folke/snacks.nvim/pull/445

NOTE: I'm **not** going to replace `fzf-lua` anytime soon. Learned my
lessons with that one :)

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## Checklist

- [x] I've read the
[CONTRIBUTING](https://github.com/LazyVim/LazyVim/blob/main/CONTRIBUTING.md)
guidelines.

lua/lazyvim/plugins/ui.lua

@@ -288,6 +288,9 @@ return {
     opts = {
       dashboard = {
         preset = {
+          pick = function(cmd, opts)
+            return LazyVim.pick(cmd, opts)()
+          end,
           header = [[
           ██╗      █████╗ ███████╗██╗   ██╗██╗   ██╗██╗███╗   ███╗          Z
           ██║     ██╔══██╗╚══███╔╝╚██╗ ██╔╝██║   ██║██║████╗ ████║      Z