make util.list_orientation_runs() faster

[prjemian]

Execution time of util.list_orientation_runs() is proportional to catalog size. On one workstation, 10 runs/second is typical since this code must be executed for every run to be checked:

hklpy/hkl/util.py

Lines 306 to 315 in f91c18d

	run_conf = run.primary.config
	for device in sorted(run_conf):
	conf = run_conf[device].read()
	if f"{device}_orientation_attrs" in conf:
	# fmt:off
	devices[device] = {
	item[len(device)+1:]: conf[item].to_dict()["data"][0]
	for item in conf
	}
	# fmt:on

Significant optimization is possible by adding a key to the start document metadata that describes if orientation info is available and for what geometries. A use_md_key=True kwarg (default) to util.list_orientation_runs() would support the new key. Old-style search would still be possible by setting use_md_key=False.