feat: suppor to download magnet files

[LinuxSuRen]

No description provided.

[codecov]

Codecov Report

Merging #325 (0062804) into master (c9ab375) will decrease coverage by 0.75%.
The diff coverage is 25.64%.

@@            Coverage Diff             @@
##           master     #325      +/-   ##
==========================================
- Coverage   56.34%   55.59%   -0.75%     
==========================================
  Files          60       60              
  Lines        2971     3038      +67     
==========================================
+ Hits         1674     1689      +15     
- Misses       1220     1267      +47     
- Partials       77       82       +5     

Flag	Coverage Δ
unittests	55.59% <25.64%> (-0.75%)	⬇️

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

Impacted Files	Coverage Δ
pkg/exec/command.go	8.10% <0.00%> (-0.23%)	⬇️
pkg/installer/fetch.go	11.26% <0.00%> (-0.77%)	⬇️
pkg/os/generic/common.go	81.81% <0.00%> (ø)
cmd/get.go	63.73% <3.33%> (-10.08%)	⬇️
cmd/fetch.go	71.15% <38.09%> (-20.28%)	⬇️
pkg/installer/check.go	35.53% <75.00%> (+1.19%)	⬆️
pkg/exec/fake-command.go	100.00% <100.00%> (ø)

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