feat: Add custom scripts and hook based setup

This commit introduces a hook system that allows the user to add custom
modules which can use these hooks to invoke function af specific NvChad
events to allow for extending og functionality

lua/custom/init.lua

@@ -0,0 +1,2 @@
+-- This is where you custom modules and plugins goes.
+-- See the wiki for a guide on how to extend NvChad