Move ensemble import to teleprompt (#542)

Author: isaacbmiller

dspy/teleprompt/__init__.py

@@ -1,4 +1,5 @@
 from .bootstrap import *
+from .ensemble import *
 from .finetune import *
 from .knn_fewshot import *
 from .random_search import *

tests/teleprompt/test_ensemble.py

@@ -1,6 +1,6 @@
 import pytest
 import dspy
-from dspy.teleprompt.ensemble import Ensemble
+from dspy.teleprompt import Ensemble
 
 
 class MockProgram(dspy.Module):