From OSMO: Make rechecking tx check the sequence number

[assafmo]

osmosis-labs@ee16076

[assafmo]

https://twitter.com/valardragon/status/1524295888801251328

[assafmo]

As explained to me by @ValarDragon, this PR optimizes the RecheckTx step in the mempool code, which sweeps all remaining txs in the mempool after a successful block commit. When RecheckTx is executed it can be assumed that CheckTx was successful for the tx.

1. This PR makes it that RecheckTx doesn't recheck the tx signature, which was valid on CheckTx. This saves a lot of time.
2. This PR makes it that RecheckTx checks if the tx sequence number is still valid and removes the tx from the mempool if not. This should eliminate txs with a "sequence mismatch" being proposed and committed on-chain, which is a pain point when there's a huge network traffic spike (NFT drops) and when bots are trying to spam the network.