feat: mapping and options to sort entries in help window (#2482)

* feat: add option to sort entries in help window

* stylua

* Add keymap to toggle sorting methods

* Bug fix

---------

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

lua/nvim-tree.lua

@@ -588,6 +588,9 @@ local DEFAULT_OPTS = { -- BEGIN_DEFAULT_OPTS
     threshold = vim.log.levels.INFO,
     absolute_path = true,
   },
+  help = {
+    sort_by = "key",
+  },
   ui = {
     confirm = {
       remove = true,
@@ -667,6 +670,9 @@ local ACCEPTED_STRINGS = {
       bookmarks_placement = { "before", "after", "signcolumn" },
     },
   },
+  help = {
+    sort_by = { "key", "desc" },
+  },
 }
 
 local function validate_options(conf)