Explore new endpoint for uploading file

[havok2063]

Explore option for new endpoint for uploading a file with a list of targets ids or coordinates to search on. Related to sdss/zora#70. We'll need to think about whether this route would do the search, or if it should only validate the file inputs and the return the validated targets, to allow the user to append query options to it. We don't necessarily want to maintain a third way for people to search.