feat(models): Added __init__.py

Exports all model classes for easy importing

models/__init__.py

@@ -0,0 +1,10 @@
+from .itm import (
+    TestModel,
+    StepModel,
+    RequestModel,
+    ExtractModel,
+    AssertModel,
+    AuthModel,
+)
+from .context import Context
+from .runner import TestRunner, TestResult, StepResult