Add property to apply offset to beamline in HLT1

To be able to create a geometry for the standalone build that has an offset to the beamline and run on 2023 MC which has the beamline not at the center of the velo, an option has been added to DumpBeamline allow propagation of the required offset to HLT1 reconstruction algorithms.

To use it add to a top-level options file:

from Configurables import DumpBeamline
DumpBeamline().Offset = (x_offset, y_offset)

An example options file is included: $BINARYDUMPERSROOT/options/sim10b_velo_open_minbias.py; that can be used together with $BINARYDUMPERSROOT/options/dump_geometry.py to create binary geometry files for standalone running or testing of Allen.