hash secondary exposures and undelegated secondary exposures (#267)

Context:
https://statsigconnect.slack.com/archives/C04QTFAJCS3/p1718404230965199


![image](https://github.com/statsig-io/private-python-sdk/assets/137219293/d74e8b29-53a3-4a3b-87c5-76fdc728f6e6)

statsig/client_initialize_formatter.py

@@ -59,7 +59,7 @@ def config_to_response(config_name, config_spec):
             result = {
                 "name": hashed_name,
                 "rule_id": eval_result.rule_id,
-                "secondary_exposures": eval_result.secondary_exposures,
+                "secondary_exposures": hash_exposures(eval_result.secondary_exposures, hash_algo),
                 "value": False
             }
 
@@ -134,6 +134,11 @@ def populate_layer_fields(config_spec, eval_result, result, hash_algo):
 
             result["undelegated_secondary_exposures"] = eval_result.undelegated_secondary_exposures or []
 
+        def hash_exposures(exposures: list, algo: HashingAlgorithm):
+            for exposure in exposures:
+                exposure['gate'] = hash_name(exposure['gate'], algo)
+            return exposures
+
         def filter_nones(arr):
             return dict([i for i in arr if i is not None])