feat: ed2k protocol support

[monkeyWie]

Fixed: #1185 #56 #388 #310

[codecov]

Codecov Report

❌ Patch coverage is 20.42042% with 265 lines in your changes missing coverage. Please review.
✅ Project coverage is 71.02%. Comparing base (f7b2675) to head (18b3a67).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/protocol/ed2k/fetcher.go	17.05%	241 Missing and 7 partials ⚠️
pkg/download/downloader.go	46.42%	13 Missing and 2 partials ⚠️
pkg/download/model.go	66.66%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1316      +/-   ##
==========================================
- Coverage   73.74%   71.02%   -2.72%     
==========================================
  Files          48       49       +1     
  Lines        6192     6519     +327     
==========================================
+ Hits         4566     4630      +64     
- Misses       1207     1461     +254     
- Partials      419      428       +9     

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