add missing __init__

src/axolotl/prompt_strategies/__init__.py

@@ -0,0 +1,11 @@
+import importlib
+from functools import cache
+
+@cache
+def load(strategy, tokenizer, cfg):
+    try:
+        m = importlib.import_module(f".{strategy}", axolotl.prompt_strategies)
+        fn = getattr(m, "load")
+        return fn(tokenizer, cfg)
+    except:
+        pass