Implement proposal support service init via config string

[Xuanwo]

No description provided.

[codecov]

Codecov Report

Merging #38 into master will decrease coverage by 0.02%.
The diff coverage is 81.06%.

@@            Coverage Diff             @@
##           master      #38      +/-   ##
==========================================
- Coverage   77.99%   77.97%   -0.03%     
==========================================
  Files           9       14       +5     
  Lines         968     1067      +99     
==========================================
+ Hits          755      832      +77     
- Misses        138      157      +19     
- Partials       75       78       +3

Impacted Files	Coverage Δ
pkg/credential/static.go	100% <ø> (ø)
services/fs/meta.go	78.37% <ø> (ø)
services/qingstor/meta.go	65.53% <ø> (ø)	⬆️
pkg/endpoint/static.go	100% <100%> (ø)
pkg/credential/credential.go	100% <100%> (ø)
pkg/endpoint/endpoint.go	100% <100%> (ø)
services/fs/storager.go	92.63% <100%> (ø)
services/qingstor/utils.go	82.05% <22.22%> (-17.95%)	⬇️
services/fs/utils.go	68% <42.85%> (ø)
services/qingstor/servicer.go	61.46% <61.53%> (ø)
... and 7 more

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