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/deprecated.lua

@@ -0,0 +1,59 @@
+local M = {}
+
+M.moved = {
+  lsp = {
+    rename_file = { "Snacks.rename.rename_file" },
+    on_rename = { "Snacks.rename.on_rename_file" },
+    words = { "Snacks.words" },
+  },
+  terminal = {
+    open = { "Snacks.terminal" },
+    __call = { "Snacks.terminal" },
+  },
+  ui = {
+    statuscolumn = { "Snacks.statuscolumn" },
+    bufremove = { "Snacks.bufdelete" },
+  },
+}
+
+---@param name string
+---@param mod table
+function M.decorate(name, mod)
+  if not M.moved[name] then
+    return mod
+  end
+  setmetatable(mod, {
+    __call = function(_, ...)
+      local to = M.moved[name].__call[1]
+      LazyVim.deprecate("LazyVim." .. name, to)
+      local ret = vim.tbl_get(_G, unpack(vim.split(to, ".", { plain = true })))
+      return ret(...)
+    end,
+    __index = function(_, k)
+      if M.moved[name][k] then
+        local to = M.moved[name][k][1]
+        LazyVim.deprecate("LazyVim." .. name .. "." .. k, to)
+        local ret = vim.tbl_get(_G, unpack(vim.split(to, ".", { plain = true })))
+        return ret
+      end
+      return nil
+    end,
+  })
+end
+
+function M.lazygit()
+  LazyVim.deprecate("LazyVim.lazygit", "Snacks.lazygit")
+  return Snacks.lazygit
+end
+
+function M.toggle()
+  LazyVim.deprecate("LazyVim.toggle", "Snacks.toggle")
+  return {
+    map = function() end,
+    wrap = function()
+      return {}
+    end,
+  }
+end
+
+return M