feat(notify): add notify.threshold (#1693)

* feat: configurable notification level

add `notify.threshold` to setup opts

* feat: configurable notification level: add threshold example doc

* feat: configurable notification level: log always comes last

Co-authored-by: Alexander Courtis <alex@courtis.org>

lua/nvim-tree/renderer/components/git.lua

@@ -1,4 +1,4 @@
-local utils = require "nvim-tree.utils"
+local notify = require "nvim-tree.notify"
 
 local M = {
   SIGN_GROUP = "NvimTreeGitSigns",
@@ -68,7 +68,7 @@ end
 local function nil_() end
 
 local function warn_status(git_status)
-  utils.notify.warn(
+  notify.warn(
     'Unrecognized git state "'
       .. git_status
       .. '". Please open up an issue on https://github.com/nvim-tree/nvim-tree.lua/issues with this message.'