feat: implement RESTful API for stop page data

[boringcactus]

Asana task: Determine how back-end service will provide non-real-time data to the client › Set up HTTP queries

I'm using the JSONAPI Elixir library to make this easier, but that name conflicts (in extremely annoying to debug ways) with the un-namespaced JsonApi module from dotcom, so I've moved that module to MBTAV3API.JsonApi and added in aliases in the places it's used.

Also changes how we manage test data.

[github-actions]

Coverage of commit 60826ba

Summary coverage rate:
  lines......: 55.3% (487 of 880 lines)
  functions..: 51.9% (257 of 495 functions)
  branches...: no data found

Files changed coverage rate:
                                                              |Lines       |Functions  |Branches    
  Filename                                                    |Rate     Num|Rate    Num|Rate     Num
  ==================================================================================================
  lib/mbta_v3_api/json_api.ex                                 |91.3%     46| 100%    15|    -      0
  lib/mbta_v3_api/mbta_v3_api.ex                              |77.3%     44|81.8%    11|    -      0
  lib/mbta_v3_api/mbta_v3_api/routes.ex                       | 7.1%     14|10.0%    10|    -      0
  lib/mbta_v3_api/route_patterns/route_pattern.ex             | 9.1%     11|14.3%     7|    -      0
  lib/mbta_v3_api/routes/parser.ex                            |58.5%     41| 100%    12|    -      0
  lib/mbta_v3_api/routes/repo.ex                              | 8.7%     46|37.5%    16|    -      0
  lib/mbta_v3_api/stops/api.ex                                |68.2%    110|96.8%    31|    -      0
  lib/mix/tasks/mock_api.ex                                   | 0.0%     16| 0.0%     2|    -      0
  lib/mobile_app_backend_web/controllers/route_pattern_view.ex| 100%      2|31.8%    22|    -      0
  lib/mobile_app_backend_web/controllers/route_view.ex        | 100%      5|50.0%    24|    -      0
  lib/mobile_app_backend_web/controllers/stop_controller.ex   | 100%      7|85.7%     7|    -      0
  lib/mobile_app_backend_web/controllers/stop_view.ex         | 100%      5|54.2%    24|    -      0
  lib/mobile_app_backend_web/router.ex                        |80.0%     10|71.4%    14|    -      0
  test/support/helpers.ex                                     | 100%      2|75.0%     4|    -      0
  test/support/mock_api_data.ex                               | 100%      8| 100%     1|    -      0

Download coverage report

[EmmaSimon]

Love how much this cleans up the tests, and the view and controller code is nice and straightforward, good work. 👍 I've got a few general questions, but nothing blocking.

[github-actions]

Coverage of commit 6303b92

Summary coverage rate:
  lines......: 55.9% (492 of 880 lines)
  functions..: 52.1% (258 of 495 functions)
  branches...: no data found

Files changed coverage rate:
                                                              |Lines       |Functions  |Branches    
  Filename                                                    |Rate     Num|Rate    Num|Rate     Num
  ==================================================================================================
  lib/mbta_v3_api/json_api.ex                                 |91.3%     46| 100%    15|    -      0
  lib/mbta_v3_api/mbta_v3_api.ex                              |88.6%     44|90.9%    11|    -      0
  lib/mbta_v3_api/mbta_v3_api/routes.ex                       | 7.1%     14|10.0%    10|    -      0
  lib/mbta_v3_api/route_patterns/route_pattern.ex             | 9.1%     11|14.3%     7|    -      0
  lib/mbta_v3_api/routes/parser.ex                            |58.5%     41| 100%    12|    -      0
  lib/mbta_v3_api/routes/repo.ex                              | 8.7%     46|37.5%    16|    -      0
  lib/mbta_v3_api/stops/api.ex                                |68.2%    110|96.8%    31|    -      0
  lib/mix/tasks/mock_api.ex                                   | 0.0%     16| 0.0%     2|    -      0
  lib/mobile_app_backend_web/controllers/route_pattern_view.ex| 100%      2|31.8%    22|    -      0
  lib/mobile_app_backend_web/controllers/route_view.ex        | 100%      5|50.0%    24|    -      0
  lib/mobile_app_backend_web/controllers/stop_controller.ex   | 100%      7|85.7%     7|    -      0
  lib/mobile_app_backend_web/controllers/stop_view.ex         | 100%      5|54.2%    24|    -      0
  lib/mobile_app_backend_web/router.ex                        |80.0%     10|71.4%    14|    -      0
  test/support/helpers.ex                                     | 100%      2|75.0%     4|    -      0
  test/support/mock_api_data.ex                               | 100%      8| 100%     1|    -      0

Download coverage report