`MEDYAN.set_chem_boundary!`

`Tuple{MEDYAN.Context, MEDYAN.Boundary}`

set_chem_boundary!(
    c::MEDYAN.Context,
    boundary::MEDYAN.Boundary
)

Set chemical boundary Note, the chem boundary should be outside the mech boundary so that it is rare for filaments to go outside the chem boundary.

Make sure to call apply_chem_boundary! to update the chem voxels.