feat: Phoenix LiveDashboard

[cmaddox5]

Asana task: ad-hoc

This adds the Phoenix LiveDashboard to the admin endpoint. Will only be accessible by users who are in the screens-admin group. You can access it via /admin/dashboard. On the page, there are various tabs and panels that show different pieces of info about our server. This includes a Processes tab that actually lists out all of the running processes. I also enabled a request logger, but you have to manually enable a cookie to see it work.

• Tests added?

[github-actions]

Coverage of commit 662f9ce

Summary coverage rate:
  lines......: 40.4% (2296 of 5684 lines)
  functions..: 41.8% (1051 of 2512 functions)
  branches...: no data found

Files changed coverage rate:
                                                                           |Lines       |Functions  |Branches    
  Filename                                                                 |Rate     Num|Rate    Num|Rate     Num
  ===============================================================================================================
  lib/screens_web/endpoint.ex                                              | 100%      2|36.8%    19|    -      0
  lib/screens_web/router.ex                                                |35.7%     42|30.5%    82|    -      0
  lib/screens_web/telemetry.ex                                             | 0.0%      5| 0.0%     4|    -      0

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[jzimbel-mbta]

Nice, this should definitely come in handy.