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/plugins/lsp/init.lua

@@ -129,8 +129,6 @@ return {
       LazyVim.lsp.setup()
       LazyVim.lsp.on_dynamic_capability(require("lazyvim.plugins.lsp.keymaps").on_attach)
 
-      LazyVim.lsp.words.setup(opts.document_highlight)
-
       -- diagnostics signs
       if vim.fn.has("nvim-0.10.0") == 0 then
         if type(opts.diagnostics.signs) ~= "boolean" then