Refactor: extract peer list in torrent repository entry

[josecelano]

This PR extracts a new type, "PeerList", used in the torrent repository entry.

Why

• It can be tested independently (unit tests and benchmarking).
• Other implementations could be added in the future. This abstraction hides implementation details (the collection used).

Performance

It looks like it does not affect the performance.

Requests out: 406025.97/second
Responses in: 365423.41/second
  - Connect responses:  180950.24
  - Announce responses: 180818.87
  - Scrape responses:   3654.30
  - Error responses:    0.00
Peers per announce response: 0.00
Announce responses per info hash:
  - p10: 1
  - p25: 1
  - p50: 1
  - p75: 1
  - p90: 2
  - p95: 3
  - p99: 104
  - p99.9: 295
  - p100: 367

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.55%. Comparing base (52b7e3a) to head (40182b4).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #797      +/-   ##
===========================================
+ Coverage    78.15%   78.55%   +0.40%     
===========================================
  Files          159      160       +1     
  Lines         8857     9024     +167     
===========================================
+ Hits          6922     7089     +167     
  Misses        1935     1935              

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[josecelano]

ACK 40182b4