Overhaul core Tracker: extract torrents context (part 2)

[josecelano]

This is part 2 of the refactor initiated here.

The core Tracker after this refactor:

pub struct Tracker {
    /// The tracker configuration.
    config: Core,

    /// The service to check is a torrent is whitelisted.
    whitelist_authorization: Arc<whitelist::authorization::Authorization>,

    /// The in-memory torrents repository.
    in_memory_torrent_repository: Arc<InMemoryTorrentRepository>,

    /// The persistent torrents repository.
    db_torrent_repository: Arc<DatabasePersistentTorrentRepository>,
}

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.39%. Comparing base (a4277a7) to head (046578d).
Report is 5 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1204      +/-   ##
===========================================
+ Coverage    78.03%   78.39%   +0.36%     
===========================================
  Files          191      191              
  Lines        12999    13097      +98     
  Branches     12999    13097      +98     
===========================================
+ Hits         10144    10268     +124     
+ Misses        2687     2668      -19     
+ Partials       168      161       -7     

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[josecelano]

ACK 046578d