feat(core)!: move a bunch of LazyVim features to snacks.nvim (#4706)

## Description

LazyVim comes with a bunch of smaller QoL plugin like features, but it's
not easy for non LazyVim users to use them.

That's why I started working on
[snacks.nvim](https://github.com/folke/snacks.nvim), a collection of
small QoL plugins for Neovim.

Snacks also includes a bunch of new improvements to these features.

This PR fully integrates with snacks.

## Todo

- [ ] add proper deprecations where needed
- [ ] create snacks docs
- [ ] document all the new improvements relevant to LazyVim users

## Closes

- [ ] #4492 
- [ ] #4333
- [ ] #4687

## Screenshots

<!-- Add screenshots of the changes if applicable. -->

## Checklist

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

lua/lazyvim/util/format.lua

@@ -177,4 +177,20 @@ function M.setup()
   end, { desc = "Show info about the formatters for the current buffer" })
 end
 
+---@param buf? boolean
+function M.snacks_toggle(buf)
+  return Snacks.toggle({
+    name = "Auto Format (" .. (buf and "Buffer" or "Global") .. ")",
+    get = function()
+      if not buf then
+        return vim.g.autoformat == nil or vim.g.autoformat
+      end
+      return LazyVim.format.enabled()
+    end,
+    set = function(state)
+      LazyVim.format.enable(state, buf)
+    end,
+  })
+end
+
 return M