Add rule loader and dependencies

Co-Authored-By: Justin Ibarra <brokensound77@users.noreply.github.com>

detection_rules/__init__.py

@@ -0,0 +1,24 @@
+# Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+# or more contributor license agreements. Licensed under the Elastic License;
+# you may not use this file except in compliance with the Elastic License.
+
+"""Detection rules."""
+from . import eswrap
+from . import main
+from . import mappings
+from . import misc
+from . import rule_formatter
+from . import rule_loader
+from . import schema
+from . import utils
+
+__all__ = (
+    'eswrap',
+    'mappings',
+    "main",
+    'misc',
+    'rule_formatter',
+    'rule_loader',
+    'schema',
+    'utils',
+)