label 与 sampletype 的group列表在api层组装，不在存储层做处理

[xyctruth]

No description provided.

[codecov]

Codecov Report

Merging #32 (b679236) into master (74e3f81) will increase coverage by 0.09%.
The diff coverage is 92.85%.

@@            Coverage Diff             @@
##           master      #32      +/-   ##
==========================================
+ Coverage   75.77%   75.86%   +0.09%     
==========================================
  Files          16       16              
  Lines         995      978      -17     
==========================================
- Hits          754      742      -12     
+ Misses        189      185       -4     
+ Partials       52       51       -1     

Flag	Coverage Δ
unittests	75.86% <92.85%> (+0.09%)	⬆️

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

Impacted Files	Coverage Δ
pkg/storage/badger/store.go	73.98% <0.00%> (-1.21%)	⬇️
pkg/storage/store.go	40.00% <ø> (ø)
pkg/apiserver/api.go	68.92% <100.00%> (+1.27%)	⬆️
pkg/storage/badger/func.go	90.00% <100.00%> (ø)
pkg/collector/collector.go	74.31% <0.00%> (+1.09%)	⬆️

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