feat: add ConsumeGas for delayed staking

[dongsam]

Summary

Problem Definition

As Delayed Staking is introduced into F1, add staking in the queue and runs in end-of-epoch, so the gas of MsgStake is consumed less than the total computation amount, which can adversely affect the chain.

Proposal

Therefore, it is necessary to add the average amount of gas to be calculated at the end-of-epoch of the end-block to the params and add the gas to the MsgStake step in the same way as ctx.GasMeter().ConsumeGas(params.EndBlockStakingGasFee, "EndBlockStakingGasFee")

Tasks

• add ConsumeGas logic for MsgStake on msg_server
• Calculate average amount of gas to be consumed at the end-of-epoch for QueuedStaking
• add params.delayed_staking_gas_fee

References

• https://github.com/bandprotocol/chain/blob/e392c1f4f412ec10fd151f0984bb6d6614bb6200/x/oracle/keeper/owasm.go#L71-L134
• Better gas error management inside PrepareRequest bandprotocol/chain#81
• Run stress test on delayed staking #94

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For Admin Use

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

[hallazzang]

Using this test code:

func (suite *KeeperTestSuite) TestEstimateGasUsage_Stake() {
	for i := 1; i <= 10; i++ {
		suite.SetRatioPlan(uint64(i), suite.addrs[4], map[string]string{
			denom1: "0.5",
			denom2: "0.5",
		}, "0.01")
	}

	addrs := simapp.AddTestAddrs(suite.app, suite.ctx, 10000, sdk.ZeroInt())
	for i, addr := range addrs {
		err := simapp.FundAccount(suite.app.BankKeeper, suite.ctx, addr, sdk.NewCoins(
			sdk.NewInt64Coin(denom1, 100000000), sdk.NewInt64Coin(denom2, 100000000)))
		suite.Require().NoError(err)
		if i > 0 {
			suite.Stake(addr, sdk.NewCoins(sdk.NewInt64Coin(denom1, 100000000), sdk.NewInt64Coin(denom2, 100000000)))
		}
	}

	suite.AdvanceEpoch()
	suite.AdvanceEpoch()

	for i := 0; i < 3; i++ {
		suite.Stake(addrs[0], sdk.NewCoins(sdk.NewInt64Coin(denom1, 10000000), sdk.NewInt64Coin(denom2, 10000000)))

		err := suite.keeper.AllocateRewards(suite.ctx)
		suite.Require().NoError(err)

		suite.ctx = suite.ctx.WithGasMeter(sdk.NewInfiniteGasMeter())
		suite.keeper.ProcessQueuedCoins(suite.ctx)
		fmt.Println(suite.ctx.GasMeter().GasConsumed())
	}
}

It seems it takes about 60,000 gases to handle queued staking(with withdrawing rewards) per staking coin denom.