Removes OneOf due to complexity and niche use case

After further analysis, the functionality was deemed too complex to implement for such a niche use case and will therefore be removed from the implementation backlog

tests/parser/test_anyof_type_parser.py

@@ -0,0 +1,25 @@
+from jambo.parser.anyof_type_parser import AnyOfTypeParser
+
+from typing import Union, get_args, get_origin
+from unittest import TestCase
+
+
+class TestAnyOfTypeParser(TestCase):
+    def test_any_of_string_or_int(self):
+        """
+        Tests the AnyOfTypeParser with a string or int type.
+        """
+
+        properties = {
+            "anyOf": [
+                {"type": "string"},
+                {"type": "integer"},
+            ],
+        }
+
+        type_parsing, _ = AnyOfTypeParser.from_properties("placeholder", properties)
+
+        # check union type has string and int
+        self.assertEqual(get_origin(type_parsing), Union)
+        self.assertIn(str, get_args(type_parsing))
+        self.assertIn(int, get_args(type_parsing))