feat: add status api to detect api ready

[hunjixin]

关联的Issues (Related Issues)

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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

[hunjixin]

filecoin-project/venus#4887

[codecov-commenter]

Codecov Report

Merging #282 (0e3ce38) into master (a0ec3cd) will increase coverage by 0.01%.
The diff coverage is 0.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #282      +/-   ##
==========================================
+ Coverage   23.12%   23.13%   +0.01%     
==========================================
  Files         179      179              
  Lines       20176    20184       +8     
==========================================
+ Hits         4666     4670       +4     
- Misses      14734    14739       +5     
+ Partials      776      775       -1     

Flag	Coverage Δ
unittests	23.13% <0.00%> (+0.01%)	⬆️

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

Impacted Files	Coverage Δ
cmd/market-client/main.go	0.00% <0.00%> (ø)
cmd/venus-market/main.go	0.00% <ø> (ø)
cmd/venus-market/run.go	0.00% <0.00%> (ø)
rpc/rpc.go	0.00% <0.00%> (ø)
models/badger/storage_deal.go	69.73% <0.00%> (-0.39%)	⬇️
paychmgr/simple.go	80.41% <0.00%> (+1.13%)	⬆️

[simlecode]

LGTM