chore(rename): move llama_stack.distribution to llama_stack.core (#2975)

We would like to rename the term `template` to `distribution`. To
prepare for that, this is a precursor.

cc @leseb

llama_stack/core/utils/config.py

@@ -0,0 +1,30 @@
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+# All rights reserved.
+#
+# This source code is licensed under the terms described in the LICENSE file in
+# the root directory of this source tree.
+
+from typing import Any
+
+
+def redact_sensitive_fields(data: dict[str, Any]) -> dict[str, Any]:
+    """Redact sensitive information from config before printing."""
+    sensitive_patterns = ["api_key", "api_token", "password", "secret"]
+
+    def _redact_value(v: Any) -> Any:
+        if isinstance(v, dict):
+            return _redact_dict(v)
+        elif isinstance(v, list):
+            return [_redact_value(i) for i in v]
+        return v
+
+    def _redact_dict(d: dict[str, Any]) -> dict[str, Any]:
+        result = {}
+        for k, v in d.items():
+            if any(pattern in k.lower() for pattern in sensitive_patterns):
+                result[k] = "********"
+            else:
+                result[k] = _redact_value(v)
+        return result
+
+    return _redact_dict(data)