feat(extras): added fzf-lua (#3555)

New extra with an initial implementation of fzf-lua.

## Todo

- [x] check all places that currently depend on telescope and provide an
alternative or disable
- [x] disable telescope spec completely. (currently only removed its
keymaps)
- [x] trouble integration
- [x] https://github.com/ibhagwan/fzf-lua/issues/1241

---------

Co-authored-by: Iordanis Petkakis <12776461+dpetka2001@users.noreply.github.com>

lua/lazyvim/util/root.lua

@@ -168,13 +168,14 @@ end
 -- * lsp root_dir
 -- * root pattern of filename of the current buffer
 -- * root pattern of cwd
----@param opts? {normalize?:boolean}
+---@param opts? {normalize?:boolean, buf?:number}
 ---@return string
 function M.get(opts)
-  local buf = vim.api.nvim_get_current_buf()
+  opts = opts or {}
+  local buf = opts.buf or vim.api.nvim_get_current_buf()
   local ret = M.cache[buf]
   if not ret then
-    local roots = M.detect({ all = false })
+    local roots = M.detect({ all = false, buf = buf })
     ret = roots[1] and roots[1].paths[1] or vim.uv.cwd()
     M.cache[buf] = ret
   end