feat(tdcgal/plane/objects.py): add class Bbox2D

BREAKING CHANGE:

tdcgal/plane/objects.py

@@ -481,3 +481,28 @@ class IsoRectangle2D(Shape2D, Iso_rectangle_2):
     # 返回第index个顶点
     def __getitem__(self, index: int) -> Point2D:
         return self.vertex(index)
+
+
+# 二维欧几里德平面中的边界框
+class Bbox2D(Shape2D, Bbox_2):
+    def __init__(
+        self,
+        coord: Tuple[float, float, float, float] = None
+        **kwargs,
+    ):
+        """
+        二维欧几里德平面中的边界框Bbox2D的初始化方法
+
+        Args:
+            coord: 边界框的坐标, 形式为(xmin, ymin, xmax, ymax)
+        """
+        Shape2D.__init__(self, **kwargs)
+        if coord is not None:
+            Bbox_2.__init__(self, *coord)
+        else:
+            Bbox_2.__init__(self)
+
+    # 重载`repr`方法，返回Bbox2D的字符串表示
+    def __repr__(self) -> str:
+        return f"Bbox2D(xmin: {self.xmin}, ymin: {self.ymin}, xmax: {self.xmax}, ymax: {self.ymax})"
+