Add type annotations to json module

Author: jaepil

monic/runtime/json.py

@@ -5,15 +5,16 @@
 #
 
 import json
+import typing as t
 
 from monic.expressions.registry import monic_bind_default
 
 
 @monic_bind_default("json.dumps")
-def json_dumps(obj, *args, **kwargs):
+def json_dumps(obj, *args, **kwargs) -> str:
     return json.dumps(obj, *args, **kwargs)
 
 
 @monic_bind_default("json.loads")
-def json_loads(s, *args, **kwargs):
+def json_loads(s, *args, **kwargs) -> t.Any:
     return json.loads(s, *args, **kwargs)