feat: add OpenTripPlanner client based on dotcom code

[boringcactus]

I think there are some pieces of at least the logging that would benefit from a bit more attention than I've given them so far.

Removes Swoosh because of Req version conflicts with AbsintheClient, as mentioned in Slack.

Does not yet incorporate the parameter changes that are suggested in the explainable properties writeup. Does, however, include the suggested tags there.

[github-actions]

Coverage of commit c59cf36

Summary coverage rate:
  lines......: 60.1% (622 of 1035 lines)
  functions..: 56.9% (310 of 545 functions)
  branches...: no data found

Files changed coverage rate:
                                                                |Lines       |Functions  |Branches    
  Filename                                                      |Rate     Num|Rate    Num|Rate     Num
  ====================================================================================================
  lib/mobile_app_backend_web/router.ex                          |80.0%     10|71.4%    14|    -      0
  lib/open_trip_planner_client.ex                               | 100%     27| 100%     5|    -      0
  lib/open_trip_planner_client/itinerary.ex                     |72.7%     11|63.6%    11|    -      0
  lib/open_trip_planner_client/itinerary_tag.ex                 | 100%     10| 100%     1|    -      0
  lib/open_trip_planner_client/itinerary_tag/earliest_arrival.ex| 100%      3| 100%     3|    -      0
  lib/open_trip_planner_client/itinerary_tag/least_walking.ex   | 100%      3| 100%     3|    -      0
  lib/open_trip_planner_client/itinerary_tag/shortest_trip.ex   | 100%      3| 100%     3|    -      0
  lib/open_trip_planner_client/leg.ex                           |83.3%      6| 100%     4|    -      0
  lib/open_trip_planner_client/named_position.ex                | 100%      1| 100%     2|    -      0
  lib/open_trip_planner_client/params_builder.ex                |96.3%     27| 100%     4|    -      0
  lib/open_trip_planner_client/parser.ex                        |64.3%     42| 100%    12|    -      0
  lib/open_trip_planner_client/personal_detail.ex               | 100%      2| 100%     2|    -      0
  lib/open_trip_planner_client/transit_detail.ex                | 100%      1| 100%     2|    -      0
  test/support/open_trip_planner_client.ex                      | 100%     20| 100%     7|    -      0

Download coverage report

[github-actions]

Coverage of commit 2d7fa3d

Summary coverage rate:
  lines......: 60.1% (621 of 1034 lines)
  functions..: 56.9% (310 of 545 functions)
  branches...: no data found

Files changed coverage rate:
                                                                |Lines       |Functions  |Branches    
  Filename                                                      |Rate     Num|Rate    Num|Rate     Num
  ====================================================================================================
  lib/mobile_app_backend_web/router.ex                          |80.0%     10|71.4%    14|    -      0
  lib/open_trip_planner_client.ex                               | 100%     26| 100%     5|    -      0
  lib/open_trip_planner_client/itinerary.ex                     |72.7%     11|63.6%    11|    -      0
  lib/open_trip_planner_client/itinerary_tag.ex                 | 100%     10| 100%     1|    -      0
  lib/open_trip_planner_client/itinerary_tag/earliest_arrival.ex| 100%      3| 100%     3|    -      0
  lib/open_trip_planner_client/itinerary_tag/least_walking.ex   | 100%      3| 100%     3|    -      0
  lib/open_trip_planner_client/itinerary_tag/shortest_trip.ex   | 100%      3| 100%     3|    -      0
  lib/open_trip_planner_client/leg.ex                           |83.3%      6| 100%     4|    -      0
  lib/open_trip_planner_client/named_position.ex                | 100%      1| 100%     2|    -      0
  lib/open_trip_planner_client/params_builder.ex                |96.3%     27| 100%     4|    -      0
  lib/open_trip_planner_client/parser.ex                        |64.3%     42| 100%    12|    -      0
  lib/open_trip_planner_client/personal_detail.ex               | 100%      2| 100%     2|    -      0
  lib/open_trip_planner_client/transit_detail.ex                | 100%      1| 100%     2|    -      0
  test/support/open_trip_planner_client.ex                      | 100%     20| 100%     7|    -      0

Download coverage report

[github-actions]

Coverage of commit f70d280

Summary coverage rate:
  lines......: 60.0% (261 of 435 lines)
  functions..: 55.4% (129 of 233 functions)
  branches...: no data found

Files changed coverage rate:
                                                                |Lines       |Functions  |Branches    
  Filename                                                      |Rate     Num|Rate    Num|Rate     Num
  ====================================================================================================
  lib/open_trip_planner_client.ex                               | 100%     26| 100%     5|    -      0
  lib/open_trip_planner_client/itinerary.ex                     |72.7%     11|63.6%    11|    -      0
  lib/open_trip_planner_client/itinerary_tag.ex                 | 100%     10| 100%     1|    -      0
  lib/open_trip_planner_client/itinerary_tag/earliest_arrival.ex| 100%      3| 100%     3|    -      0
  lib/open_trip_planner_client/itinerary_tag/least_walking.ex   | 100%      3| 100%     3|    -      0
  lib/open_trip_planner_client/itinerary_tag/shortest_trip.ex   | 100%      3| 100%     3|    -      0
  lib/open_trip_planner_client/leg.ex                           |83.3%      6| 100%     4|    -      0
  lib/open_trip_planner_client/named_position.ex                | 100%      1| 100%     2|    -      0
  lib/open_trip_planner_client/params_builder.ex                |96.3%     27| 100%     4|    -      0
  lib/open_trip_planner_client/parser.ex                        |64.3%     42| 100%    12|    -      0
  lib/open_trip_planner_client/personal_detail.ex               | 100%      2| 100%     2|    -      0
  lib/open_trip_planner_client/transit_detail.ex                | 100%      1| 100%     2|    -      0
  test/support/open_trip_planner_client.ex                      | 100%     20| 100%     7|    -      0

Download coverage report