Overhaul stats: Persist all torrents downloads metric

[josecelano]

Persist "all torrent downloads" metric.

Subtasks

• Add new methods to the Database trait.
• Make use of the new methods to persist the metric TRACKER_CORE_PERSISTENT_TORRENTS_DOWNLOADS_TOTAL.
• Add an integration test.

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 81 lines in your changes missing coverage. Please review.

Project coverage is 83.33%. Comparing base (3fce84b) to head (4febda4).
Report is 6 commits behind head on develop.

Files with missing lines	Patch %	Lines
...ackages/tracker-core/src/databases/driver/mysql.rs	0.00%	34 Missing ⚠️
...ckages/tracker-core/src/databases/driver/sqlite.rs	71.73%	4 Missing and 9 partials ⚠️
...s/tracker-core/src/statistics/persisted_metrics.rs	43.47%	10 Missing and 3 partials ⚠️
src/app.rs	33.33%	7 Missing and 1 partial ⚠️
...kages/tracker-core/src/statistics/event/handler.rs	36.36%	5 Missing and 2 partials ⚠️
packages/metrics/src/metric_collection.rs	85.00%	3 Missing ⚠️
...s/tracker-core/src/torrent/repository/persisted.rs	77.77%	1 Missing and 1 partial ⚠️
packages/tracker-core/src/statistics/repository.rs	93.33%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1540      +/-   ##
===========================================
- Coverage    83.52%   83.33%   -0.19%     
===========================================
  Files          273      274       +1     
  Lines        19317    19554     +237     
  Branches     19317    19554     +237     
===========================================
+ Hits         16134    16295     +161     
- Misses        2909     2969      +60     
- Partials       274      290      +16     

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[josecelano]

ACK 4febda4