BREAKING Change for statusline_separator & tabufline overriders

moved statusline & tabufline into a new plugin to keep the base config clean and fix issues like (#1307)

lua/plugins/configs/cmp.lua

@@ -47,7 +47,7 @@ local options = {
    },
    formatting = {
       format = function(_, vim_item)
-         local icons = require("ui.icons").lspkind
+         local icons = require("nvchad_ui.icons").lspkind
          vim_item.kind = string.format("%s %s", icons[vim_item.kind], vim_item.kind)
          return vim_item
       end,