Add snap packagemanger support

[LinuxSuRen]

No description provided.

[codecov]

Codecov Report

Merging #262 (a23fe0a) into master (e2c1da7) will increase coverage by 0.00%.
The diff coverage is 61.53%.

@@           Coverage Diff           @@
##           master     #262   +/-   ##
=======================================
  Coverage   25.98%   25.99%           
=======================================
  Files          28       28           
  Lines        1901     1908    +7     
=======================================
+ Hits          494      496    +2     
- Misses       1382     1387    +5     
  Partials       25       25           

Flag	Coverage Δ
unittests	25.99% <61.53%> (+<0.01%)	⬆️

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

Impacted Files	Coverage Δ
pkg/os/generic_installer.go	11.70% <0.00%> (-0.66%)	⬇️
cmd/install.go	20.60% <100.00%> (+0.34%)	⬆️
cmd/search.go	91.89% <100.00%> (+0.22%)	⬆️

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