Missing utility to find symbiflow techmap/scripts path

[olofk]

I'm working on offloading some of the work that the symbiflow_* wrappers are doing to make Edalize integration better. One thing that would be very helpful is a small utility script (like prjxray-config) that I can use to get the path of the rootdir for techmaps and scripts, e.g. /usr/local/share/symbiflow (called ${SHARE_DIR_PATH} in symbiflow_synth. Perhaps this already exists but I just haven't seen it? I can use the path of symbiflow_synth in the meantime