perf(protorev): send rewards to dev acc once per epoch

[czarcas7ic]

Closes: #7518

What is the purpose of the change

The protorev module currently calculates profits and sends the dev reward cut after every backrun. This adds unnecessary read/write overhead, causing measurable detriment to sync speed.

This PR tracks the difference between the last epoch's protorev module account to the balance at the current epoch, calculates the dev rewards once, and does a single send.

[czarcas7ic]

#7509

^ this PR should be merged before this one, so it can be properly wired

[ValarDragon]

LGTM, but I don't see a test showing that multi-denom distributes are working

[czarcas7ic]

Will get test in and then merge, thanks all

[czarcas7ic]

Im actually seeing the multi-denom test here already

osmosis/x/protorev/keeper/hooks_test.go

Lines 864 to 873 in 2978b5e

	name: "osmo denom and another base denom",
	arbProfits: sdk.NewCoins(sdk.NewCoin("uosmo", osmomath.NewInt(100000000)),
	sdk.NewCoin("juno", osmomath.NewInt(100000000))),
	},
	{
	name: "osmo denom, another base denom, and a non base denom",
	arbProfits: sdk.NewCoins(sdk.NewCoin("uosmo", osmomath.NewInt(100000000)),
	sdk.NewCoin("juno", osmomath.NewInt(100000000)),
	sdk.NewCoin("eth", osmomath.NewInt(100000000))),
	},

@ValarDragon lmk if that suffices.

[ValarDragon]

Ah great, thanks! I missed that then