chore: remove CACHE logic from sendchat and models files

aider/models.py

@@ -551,13 +551,8 @@ class Model(ModelSettings):
         key = json.dumps(kwargs, sort_keys=True).encode()
         # dump(kwargs)
         hash_object = hashlib.sha1(key)
-        from aider.sendchat import CACHE, litellm
-
-        if not stream and CACHE is not None and key in CACHE:
-            return hash_object, CACHE[key]
+        from aider.sendchat import litellm
         res = litellm.completion(**kwargs)
-        if not stream and CACHE is not None:
-            CACHE[key] = res
         return hash_object, res
 
     def simple_send_with_retries(self, messages):

aider/sendchat.py

@@ -1,12 +1,6 @@
 from aider.dump import dump  # noqa: F401
 from aider.utils import format_messages
 
-# from diskcache import Cache
-
-
-CACHE_PATH = "~/.aider.send.cache.v1"
-CACHE = None
-# CACHE = Cache(CACHE_PATH)
 
 RETRY_TIMEOUT = 60