feat(#2148): api.fs.rename_full (#2461)

* feat(#2148): add rename_full in API

* feat(#2148): add default mapping 'u' for rename_full

---------

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

lua/nvim-tree/actions/fs/rename-file.lua

@@ -10,6 +10,7 @@ local M = {
 }
 
 local ALLOWED_MODIFIERS = {
+  [":p"] = true,
   [":p:h"] = true,
   [":t"] = true,
   [":t:r"] = true,