added back tracer_utils_redis with deprecation warn

ddtrace/contrib/trace_utils_redis.py

@@ -0,0 +1,18 @@
+from ddtrace.contrib.redis_utils import determine_row_count
+from ddtrace.contrib.redis_utils import stringify_cache_args
+from ddtrace.internal.utils.deprecations import DDTraceDeprecationWarning
+from ddtrace.vendor.debtcollector import deprecate
+
+
+deprecate(
+    "The ddtrace.contrib.tracer_utils_redis module is deprecated and will be removed.",
+    message="A new interface will be provided by the ddtrace.contrib.redis_utils.",
+    category=DDTraceDeprecationWarning,
+)
+
+
+format_command_args = stringify_cache_args
+
+
+def determine_row_count(redis_command, span, result):  # noqa: F811
+    determine_row_count(redis_command=redis_command, result=result)