Group and Element Mathematical Operator Overloads

## Generic Issue

- [ ] Ensure this issue is not a bug report or feature request

**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.

L'issue non indica alcun file o test. Confronta le classi di gruppi ed elementi Python con le controparti C++, individua le operazioni matematiche di base e i vincoli ElementModP o ElementModQ che devono preservare, quindi verifica che gli overload corrispondenti si comportino in modo coerente.

Scritto dal modello di indicizzazione a partire dal testo della issue.