storager: Split Metadata to Metadata and Statistical

[Xuanwo]

No description provided.

[codecov]

Codecov Report

Merging #39 into master will increase coverage by 3.43%.
The diff coverage is 96.15%.

@@            Coverage Diff            @@
##           master     #39      +/-   ##
=========================================
+ Coverage   77.97%   81.4%   +3.43%     
=========================================
  Files          14      12       -2     
  Lines        1067     796     -271     
=========================================
- Hits          832     648     -184     
+ Misses        157     103      -54     
+ Partials       78      45      -33

Impacted Files	Coverage Δ
services/qingstor/storager.go	78.89% <100%> (+0.49%)	⬆️
services/fs/storager.go	92.72% <100%> (+0.08%)	⬆️
services/qingstor/servicer.go	61.46% <66.66%> (ø)	⬆️

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