Project: datamanagement
Issue DM-3472: Implement Basic spatial lookups for the Butler 
Based on [this |https://confluence.lsstcorp.org/display/DM/Dependencies+on+02C.06+Science+Data+Archive+and+Application+Services] pipeline software will require spatial lookups via butler. Current plan is: Provide an "ingest" script that looks at a butler exposure dataset, pulls spatial information and data ID out of it, then shoves all of that into an sqlite3 table that can be used for accelerated spatial lookups. Then provide a task that takes skymap parameters, and maps those to potentially overlapping exposures: the sqlite3 table is outside butler; and the will use a spatial location to get a dataId, and then pass that dataId into butler to get that file.
Story points: 10