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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## Related Issue(s)

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## Screenshots

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## Checklist

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

lua/lazyvim/plugins/extras/editor/fzf.lua

@@ -286,6 +286,9 @@ return {
   {
     "neovim/nvim-lspconfig",
     opts = function()
+      if LazyVim.pick.want() ~= "fzf" then
+        return
+      end
       local Keys = require("lazyvim.plugins.lsp.keymaps").get()
       -- stylua: ignore
       vim.list_extend(Keys, {