Document and systematically implement tool source and tool version somewhere #3628
Description
tool source == Which Augur collector/task/worker inserted the data
tool version == the version of that tool
We typically only change the version when there is a significant change to its collection logic (i.e., API changes, or refactoring of collection tools).
Originally posted by @sgoggins in #3587 (comment)
If the version is only changed when significant collection changes happen to the workers, we should probably also consider giving each worker/python sub package/modular component of augur its own __metadata__ file, possibly linked to/referring to the main one so its easy to update (and then having the tool_version pull from that)