refactor: The first refactored version for sdk release (#907)

Co-authored-by: chengfangyin2 <chengfangyin3@jd.com>

dbgpt/util/custom_data_structure.py

@@ -0,0 +1,34 @@
+from collections import OrderedDict
+from collections import deque
+
+
+class FixedSizeDict(OrderedDict):
+    def __init__(self, max_size):
+        super().__init__()
+        self.max_size = max_size
+
+    def __setitem__(self, key, value):
+        if len(self) >= self.max_size:
+            self.popitem(last=False)
+        super().__setitem__(key, value)
+
+
+class FixedSizeList:
+    def __init__(self, max_size):
+        self.max_size = max_size
+        self.list = deque(maxlen=max_size)
+
+    def append(self, value):
+        self.list.append(value)
+
+    def __getitem__(self, index):
+        return self.list[index]
+
+    def __setitem__(self, index, value):
+        self.list[index] = value
+
+    def __len__(self):
+        return len(self.list)
+
+    def __str__(self):
+        return str(list(self.list))