Fix: some formats of models require fixed-size input images

Update 2024.06.24: V1.1.1.1 Released

Major Changes:

• Added a new parameter static_resized_shape when initializing MathFormulaDetector, which is used to resize the input image to a fixed size. Some formats of models require fixed-size input images during inference, such as CoreML.

主要变更：

• MathFormulaDetector 初始化时加入了参数 static_resized_shape, 用于把输入图片 resize 为固定大小。某些格式的模型在推理时需要固定大小的输入图片，如 CoreML。