Add support for ansatze from arXiv:1905.10876 (Sim et al.)

[nikhilkhatri]

Adding support for ansatze 14 and 15 from the paper https://arxiv.org/abs/1905.10876 by Sim et al. These ansatze were added to DisCoPy in https://github.com/oxford-quantum-group/discopy/pull/79

[dimkart]

Thanks for this. Looks mostly ok to me, assuming that the DisCoPy parts have been implemented and tested properly.

We'll have to update docs with the new ansatze and add them in the example notebooks.

[ianyfan]

This has been incorporated into version 0.2.7: https://github.com/CQCL/lambeq/commit/c4e361ad42b1f5c43078b2cb21abb381037d1ec3