Add SchreierSims for v1

[Joseph-Edwards]

This PR adds the SchreierSims class and associated helpers in advance of the v1 release. Supersedes #109.

TODO

• Add the bindings to the cpp file;
• Expose the functionality in libsemigoups_pybind11;
• Add the the pages to the doc;
• Wrap the class in a Python class (after Update froidure-pin-hpp for v1/3 #197 is merged);
• Format the documentation and the signatures;
• Add tests.

[Joseph-Edwards]

The macOS tests are failing because SchreierSims and FroidurePin have identical constructors. @james-d-mitchell, do you think we should edit these classes to inherit from a common InitFromGenerators abstract base class, or just suppress the warning?

[james-d-mitchell]

The macOS tests are failing because SchreierSims and FroidurePin have identical constructors. @james-d-mitchell, do you think we should edit these classes to inherit from a common InitFromGenerators abstract base class, or just suppress the warning?

Maybe simplest to just add a TODO to do that later and to disable the linting error for now