Feat/start dagstore in goroutine

[LinZexiao]

关联的Issues (Related Issues)

close #504

改动 (Proposed Changes)

附注 (Additional Info)

自查清单 (Checklist)

在你认为本 PR 满足被审阅的标准之前，需要确保 / Before you mark the PR ready for review, please make sure that:

• 符合Venus项目管理规范中关于PR的相关标准 / The PR follows the PR standards set out in the Venus project management guidelines
• 具有清晰明确的commit message / All commits have a clear commit message.
• 包含相关的的测试用例或者不需要新增测试用例 / This PR has tests for new functionality or change in behaviour or not need to add new tests.
• 包含相关的的指南以及文档或者不需要新增文档 / This PR has updated usage guidelines and documentation or not need
• 通过必要的检查项 / All checks are green

[codecov-commenter]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (cb37c59) 25.51% compared to head (6f74741) 25.49%.

❗ Your organization needs to install the Codecov GitHub app to enable full functionality.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #506      +/-   ##
==========================================
- Coverage   25.51%   25.49%   -0.03%     
==========================================
  Files         178      178              
  Lines       21063    21068       +5     
==========================================
- Hits         5374     5371       -3     
- Misses      14781    14787       +6     
- Partials      908      910       +2     

Flag	Coverage Δ
unittests	25.49% <50.00%> (-0.03%)	⬇️

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

Files	Coverage Δ
dagstore/wrapper.go	39.16% <50.00%> (+0.01%)	⬆️

... and 1 file with indirect coverage changes

[simlecode]

lgtm