feat(UI): 添加显示实体属性的面板和动画效果

添加新的输入动作"showFields"用于显示/隐藏实体属性面板
创建新的FieldShow组件用于显示实体属性值
为属性面板添加显示/隐藏动画效果
调整EntityBase中属性初始化的顺序

styleboxes/leftPanel.tres

@@ -0,0 +1,15 @@
+[gd_resource type="StyleBoxFlat" format=3 uid="uid://ddnjus87wwlm8"]
+
+[resource]
+content_margin_left = 10.0
+content_margin_top = 10.0
+content_margin_right = 10.0
+content_margin_bottom = 10.0
+bg_color = Color(0, 0, 0, 0.5)
+border_width_left = 3
+border_width_top = 3
+border_width_right = 3
+border_width_bottom = 3
+border_color = Color(0, 0, 0, 0.75)
+corner_radius_top_right = 10
+corner_radius_bottom_right = 10