[openstreetmap/openstreetmap-website] Move tracepoint ordering logic into tracepoint model, and add tests (#2068)

[Andy Allan]

I should also say that I don't like the scope names suggested in this PR, since I'm concerned that they might be misleading. For example:
 * `trackable_ordered` - this scope also consists of identifiable traces, not just trackable traces. However, I realise that the existing "Trace.trackable?" method is a bit of a mind-bender since it creates a second meaning of "trackable" already.
* `non_trackable_unordered` - this scope has strictly ordered results for privacy reasons, they are not 'unordered' in the usual meaning of the word.


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