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/custom.lua

@@ -0,0 +1,22 @@
+local function isModuleAvailable(name)
+  if package.loaded[name] then
+    return true
+  else
+    for _, searcher in ipairs(package.searchers or package.loaders) do
+      local loader = searcher(name)
+      if type(loader) == 'function' then
+        package.preload[name] = loader
+        return true
+      end
+    end
+    return false
+  end
+end
+
+local loadIfExists = function (module)
+  if isModuleAvailable(module) then
+    require(module)
+  end
+end
+
+loadIfExists('custom')