circular imports with compute utils

[unalmis]

Due to how we register things in data_index:

# just need to import all the submodules here to register everything in the
     27 # data_index
---> 29 from . import (
     30     _basis_vectors,
     31     _bootstrap,
     32     _core,
     33     _curve,
     34     _equil,
     35     _field,
     36     _geometry,
     37     _metric,
     38     _neoclassical,
     39     _omnigenity,
     40     _profiles,
     41     _stability,
     42     _surface,
     43 )
     44 from .data_index import all_kwargs, allowed_kwargs, data_index
     45 from .geom_utils import rpz2xyz, rpz2xyz_vec, xyz2rpz, xyz2rpz_vec

any function defined inside A = desc/compute, called inside some directory $B \notin A$, will generate a circular import error whenever something $b \in B$ is called in $A$. This is problematic because we have general utilities inside desc/compute such as all the safedivs. We should move anything from desc/compute/utils that isn't directly related to data_index stuff to desc/utils.

To reproduce, create a compute function that uses desc/integrals/singularities or bounce integrals which both call safediv.