Add storage-agnostic function to add bonds between particles

[RudolfWeeber]

• adds a function add_bond(bond_id, particle_ids)
• use it (rather than storage-aware code) in method "add_bond" for the Particle Handle script interface
• use it in the BindCenters collision detection scheme. Here, we check via a flag, that one-sided bond storage is used, because the current implementation doesn't guarantee that cross-mpi-rank pairs are handled on both involved ranks

[RudolfWeeber]

@jngrad once you are fine with the changes, we can merge this and the remaining occurences (in the other collision detection modes) can be done as a relatively easy task next coding day.