Alternate Beampath object solution?

[kabanaty]

Quoting @eloise-nebula's comment from PR #4.

It looks like this code works, but I think I might have solved this problem in a different way. Check out this from my slac-db latest PR slaclab/slac-db#37:

def _build_devices(area, device_type):
    devices = slac_db.device.get_devices(
        area=area, device_type=device_type
    )
    for d in devices:
        if device_type == "INST" and not d.startswith("PMT"):
            continue
        if device_type == "LCAV":
            r = slac_db.oracle.get_device_row(d)
            if r["engineering name"] != "TRANS_DEFL":
                continue
        cs = _build_controls_information(d)
        meta = _build_metadata(area, device_type, d)
        yield d, {
            "controls_information": cs,
            "metadata": meta,
        }

We can rebuild YAML files by area and device type with massively reduced boilerplate. It's already been tested against the current YAML file base. I think it solves a lot of problems this PR is trying to solve.