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/core/init.lua

@@ -1,9 +1,12 @@
 local core_modules = {
+   "core.custom",
    "core.options",
    "core.autocmds",
    "core.mappings",
 }
 
+local hooks = require('core.hooks');
+
 for _, module in ipairs(core_modules) do
    local ok, err = pcall(require, module)
    if not ok then
@@ -13,3 +16,5 @@ end
 
 -- set all the non plugin mappings
 require("core.mappings").misc()
+
+hooks.run("ready")