Enable support for monitoring for challenge and submission models

[burnerlee]

Export metrics (django_model_inserts_total, django_model_updates_total and django_model_deletes_total) for models like Challenge, ChallengePhaseSplit, ChallengePhaseandSubmission`

[codecov-commenter]

Codecov Report

Merging #3482 (8e59099) into master (96968d6) will decrease coverage by 0.49%. The diff coverage is 34.50%.

@@            Coverage Diff             @@
##           master    #3482      +/-   ##
==========================================
- Coverage   72.93%   72.44%   -0.50%     
==========================================
  Files          83       20      -63     
  Lines        5368     3175    -2193     
==========================================
- Hits         3915     2300    -1615     
+ Misses       1453      875     -578     

Impacted Files	Coverage Δ
frontend/src/js/controllers/authCtrl.js	53.91% <6.38%> (-12.95%)	:arrow_down:
frontend/src/js/controllers/profileCtrl.js	79.76% <20.00%> (-13.10%)	:arrow_down:
frontend/src/js/controllers/permissionCtrl.js	36.36% <22.22%> (-63.64%)	:arrow_down:
frontend/src/js/controllers/challengeCtrl.js	65.17% <33.22%> (-8.52%)	:arrow_down:
frontend/src/js/controllers/updateProfileCtrl.js	82.55% <44.44%> (-10.30%)	:arrow_down:
frontend/src/js/controllers/challengeListCtrl.js	95.74% <50.00%> (+1.06%)	:arrow_up:
...ntend/src/js/controllers/challengeHostTeamsCtrl.js	70.50% <66.66%> (-1.18%)	:arrow_down:
frontend/src/js/controllers/teamsCtrl.js	71.17% <75.00%> (ø)
frontend/src/js/controllers/ChallengeInviteCtrl.js	100.00% <100.00%> (ø)
frontend/src/js/controllers/SubmissionFilesCtrl.js	95.45% <100.00%> (ø)
... and 30 more

Impacted Files	Coverage Δ
frontend/src/js/controllers/authCtrl.js	53.91% <6.38%> (-12.95%)	:arrow_down:
frontend/src/js/controllers/profileCtrl.js	79.76% <20.00%> (-13.10%)	:arrow_down:
frontend/src/js/controllers/permissionCtrl.js	36.36% <22.22%> (-63.64%)	:arrow_down:
frontend/src/js/controllers/challengeCtrl.js	65.17% <33.22%> (-8.52%)	:arrow_down:
frontend/src/js/controllers/updateProfileCtrl.js	82.55% <44.44%> (-10.30%)	:arrow_down:
frontend/src/js/controllers/challengeListCtrl.js	95.74% <50.00%> (+1.06%)	:arrow_up:
...ntend/src/js/controllers/challengeHostTeamsCtrl.js	70.50% <66.66%> (-1.18%)	:arrow_down:
frontend/src/js/controllers/teamsCtrl.js	71.17% <75.00%> (ø)
frontend/src/js/controllers/ChallengeInviteCtrl.js	100.00% <100.00%> (ø)
frontend/src/js/controllers/SubmissionFilesCtrl.js	95.45% <100.00%> (ø)
... and 30 more

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