Evaluation of Multi-thread Writing changes

[torao]

Summary

Reconsideration of the effect of writing by multi-thread.

• Report on the differences between current lbm-sdk and cosmos-sdk.
  • Aim of the change to lbm-sdk style implementation.
  • The actual effect of the lbm-sdk style implementation.
  • Consideration of the impact of this change on future cosmos-sdk merge task (e.g., how many changes are needed).
• Decision whether to keep the lbm-sdk implementation or revert to the cosmos-sdk implementation.
• If revert to a cosmos-sdk implementation, plan and progress of completing that work.

This task is to sort out useful features in order to reduce the differences between lbm-sdk and cosmos-sdk.

Parent: #549

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For Admin Use

• Not duplicate issue
• Appropriate labels applied
• Appropriate contributors tagged
• Contributor assigned/self-assigned

[torao]

I made this title a separate issue because the approach for performance was different from that of Caching and Prefetching, but the only relevant code is only the following:
https://github.com/line/lbm-sdk/blob/2e12c78c0aa6f9a3f38407a4020fe331af5f367a/store/cachemulti/store.go#L141-L161

Also, the origin of this change has been added with the commit for Prefetching: c3e3f47#diff-3726a67741e4ddab06683dd6e86fe5f23be2237c6c766124e32db098af8e9e74R114-R122

The work is ineffective to investigate only this small issue, and also it seems unlikely to cause conflicts with the cosmos-sdk. For this reason, we'll delegate this issue to #582, and if we revert Prefetching, we'll revert this fix as well.