Support to search a tool by the alias name

[LinuxSuRen]

Now you can install some tools with its alias name, for example:

hd search jcli
hd install jcli

[codecov]

Codecov Report

Merging #223 (175b97d) into master (d72756d) will increase coverage by 11.92%.
The diff coverage is 51.85%.

@@             Coverage Diff             @@
##           master     #223       +/-   ##
===========================================
+ Coverage   14.50%   26.42%   +11.92%     
===========================================
  Files          30       29        -1     
  Lines        1731     1760       +29     
===========================================
+ Hits          251      465      +214     
+ Misses       1461     1271      -190     
- Partials       19       24        +5     

Flag	Coverage Δ
unittests	26.42% <51.85%> (+11.92%)	⬆️

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

Impacted Files	Coverage Δ
cmd/fetch.go	51.42% <0.00%> (+51.42%)	⬆️
cmd/get.go	32.85% <0.00%> (+32.85%)	⬆️
pkg/installer/check.go	22.49% <47.05%> (+3.64%)	⬆️
pkg/installer/fetch.go	12.62% <61.53%> (+12.62%)	⬆️
cmd/search.go	91.66% <90.00%> (+91.66%)	⬆️
cmd/root.go	82.75% <100.00%> (+82.75%)	⬆️
cmd/util.go	32.78% <0.00%> (+6.55%)	⬆️
cmd/install.go	20.88% <0.00%> (+20.88%)	⬆️
... and 5 more

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