It would be useful to add [ExpSyn and Exp2Syn](https://nrn.readthedocs.io/en/latest/hoc/modelspec/programmatic/mechanisms/mech.html) to bluecellulab similar to [add_alpha_syanpse](https://github.com/openbraininstitute/BlueCelluLab/blob/f885eb37eaaf6d4a935fc8a1b8dd4b66660e0a9c/bluecellulab/cell/injector.py#L501)