concurrent checktx

[dudong2]

Summary

From #141, concurrent checktx implemented.
This logic is not managed and it is different from the structure of cosmos-sdk, so when bumping up, problems occur in a many parts.
Performance measurement is required for this.
We should consider reverting to the cosmos-sdk's way if we no longer see any performance gains.

Problem Definition

Proposal

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[dudong2]

• cosmos-sdk style tx processing flow

• lbm-sdk style tx processing flow

As a result of simple performance measurement, 1039 tps came out in cosmos-sdk style and 1704 tps came out in lbm-sdk style. We can see that processing CheckTx and RecheckTx concurrently has a great increase on performance. So, instead of rolling it back to cosmos-sdk style, we need to find a way to keep it well maintained and improve it even more.