[openstreetmap/openstreetmap-website] Use activerecord-import for bulk importing tracepoint records (#2131)

[Andy Allan]

Non-rigourous testing shows a significant speedup, even on ssds.
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/2131

-- Commit Summary --

  * Use activerecord-import for bulk importing tracepoint records

-- File Changes --

    M Gemfile (1)
    M Gemfile.lock (3)
    M app/models/trace.rb (11)
    M test/models/trace_test.rb (4)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/2131.patch
https://github.com/openstreetmap/openstreetmap-website/pull/2131.diff

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