Feature: Add search mode: local, google, baidu and UT

[lqs469]

Checklist

• [x] npm test passes
• [x] tests and/or benchmarks are included
• [ ] documentation is changed or added
• [x] commit message follows commit guidelines

Affected core subsystem(s)

search

Description of change

• search add baidu, local mode
• contorller search ut

[codecov[bot]]

Codecov Report

Merging #107 into master will increase coverage by 0.33%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #107      +/-   ##
==========================================
+ Coverage   92.57%   92.91%   +0.33%     
==========================================
  Files          37       38       +1     
  Lines        1307     1340      +33     
==========================================
+ Hits         1210     1245      +35     
+ Misses         97       95       -2

Impacted Files	Coverage Δ
app/controller/search.js	100% <100%> (ø)	:arrow_up:
app/service/user.js	100% <100%> (ø)	:arrow_up:
app/service/search.js	100% <100%> (ø)
app/controller/user.js	100% <100%> (+1.28%)	:arrow_up:
config/config.default.js	100% <100%> (ø)	:arrow_up:

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[JacksonTian]

先做下 squash + force push 吧。里面有个 try catch 看得比较奇怪。

[lqs469]

@JacksonTian 好了