feat: add status api to detect api ready

[hunjixin]

关联的Issues (Related Issues)

filecoin-project/venus#4887

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

Merging #144 (9e27317) into master (ddfaa1f) will decrease coverage by 0.04%.
The diff coverage is 0.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #144      +/-   ##
==========================================
- Coverage   42.77%   42.74%   -0.04%     
==========================================
  Files          37       37              
  Lines        4007     4010       +3     
==========================================
  Hits         1714     1714              
- Misses       2081     2083       +2     
- Partials      212      213       +1     

Flag	Coverage Δ
unittests	42.74% <0.00%> (-0.04%)	⬇️

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

Impacted Files	Coverage Δ
auth/route.go	87.60% <0.00%> (-2.23%)	⬇️

[simlecode]

LGTM