Added the built int functions registry

Still lots to do tho

playbook/action_registry/unittests/test_action_registry.py

@@ -0,0 +1,13 @@
+import os
+import unittest
+from a import ActionRegistry
+
+
+CDIR = os.path.dirname(__file__)
+
+
+class TestActionRegistry(unittest.TestCase):
+    def test_creating_action_registry(self):
+        reg: ActionRegistry = ActionRegistry("test_registry")
+
+        self.assertEqual(reg.name, "test_registry")