feat(ragdoll-wal): wal接口对齐文档；文档补充setInterval；补充测试case

[Trinoooo]

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[codecov]

Codecov Report

Attention: Patch coverage is 82.27848% with 14 lines in your changes are missing coverage. Please review.

Project coverage is 70.53%. Comparing base (b54f85b) to head (48d8cea).
Report is 2 commits behind head on main.

Files	Patch %	Lines
storage/core/ragdoll/wal/wal.go	82.27%	11 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #23      +/-   ##
==========================================
+ Coverage   69.70%   70.53%   +0.82%     
==========================================
  Files           3        3              
  Lines         713      733      +20     
==========================================
+ Hits          497      517      +20     
- Misses        139      140       +1     
+ Partials       77       76       -1     

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