feat: support to download magnet link from an url

[LinuxSuRen]

No description provided.

[codecov]

Codecov Report

Merging #335 (ccbcb3c) into master (e1055a7) will increase coverage by 0.65%.
The diff coverage is 63.46%.

@@            Coverage Diff             @@
##           master     #335      +/-   ##
==========================================
+ Coverage   57.80%   58.46%   +0.65%     
==========================================
  Files          60       61       +1     
  Lines        3067     3113      +46     
==========================================
+ Hits         1773     1820      +47     
+ Misses       1210     1203       -7     
- Partials       84       90       +6     

Flag	Coverage Δ
unittests	58.46% <63.46%> (+0.65%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
cmd/get.go	69.87% <59.57%> (+6.93%)	⬆️
pkg/exec/fake-command.go	100.00% <100.00%> (ø)
pkg/net/fake.go	100.00% <100.00%> (ø)

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