Add option for vmap + reduction in coil coil and coil plasma distance objectives

[dpanici]

does this need to be a loop or can we do vmap + reduction? It might be good to have both options with a flag like for the free boundary objective? or a batched vmap or something?

Originally posted by @f0uriest in https://github.com/PlasmaControl/DESC/pull/977#discussion_r1645117235