Evaluation of CheckTx() asynchronization changes

[torao]

Summary

Reconsideration of the effect of asynchronizing CheckTx() and separating it into CheckTxAsync() and CheckTxSync().

• 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

---

For Admin Use

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

[torao]

The CheckTxAsync() and related features in BaseApp that are the subject of this issue were introduced to implement Ostracon's abci/types/Application interface. This cannot be a target to be reverted for performance reasons alone, and is therefore excluded from the fix this time.