Overhaul core Tracker: extract torrents context (part 1)

[josecelano]

Overhaul core Tracker: extract torrents context.

The core Tracker is getting smaller and smaller. This PR reduces the dependencies to:

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

    /// The service to check is a torrent is whitelisted.
    pub 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>,
}

I will open a new PR (part 2) to continue extracting the rest of methods that are not used directly in a announce or scrape requests.

[codecov]

Codecov Report

Attention: Patch coverage is 95.00000% with 22 lines in your changes missing coverage. Please review.

Project coverage is 78.03%. Comparing base (444987b) to head (612f729).
Report is 12 commits behind head on develop.

Files with missing lines	Patch %	Lines
src/core/torrent/manager.rs	57.14%	11 Missing and 1 partial ⚠️
src/core/torrent/repository/in_memory.rs	80.95%	8 Missing ⚠️
src/bootstrap/jobs/torrent_cleanup.rs	0.00%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1202      +/-   ##
===========================================
+ Coverage    77.61%   78.03%   +0.42%     
===========================================
  Files          188      191       +3     
  Lines        12696    12999     +303     
  Branches     12696    12999     +303     
===========================================
+ Hits          9854    10144     +290     
- Misses        2678     2687       +9     
- Partials       164      168       +4     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[josecelano]

ACK 612f729