Group and Element Mathematical Operator Overloads

## Generic Issue

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**Description**
The python version of the group and element classes have Mathematical functions for things such as adding them together, doing power operations, and other more complex ones such as (a + bc) all with making sure that the answer fits into an ElementModP or ElementModQ in the end. This is not built into the C++ version of these classes.

**Possible Solution**
Implement the basic functionalities of this using mathematical operator overloading.

**Additional context/Screenshots**
Add any other context about the problem here. If applicable, add screenshots to help explain.

该 issue 没有指出任何文件或测试。将 Python 的组类和元素类与其 C++ 对应类进行比较，确定基本数学运算以及它们必须保持的 ElementModP 或 ElementModQ 约束，然后验证相应的重载行为是否一致。

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