Add example implementation for mint's InflationCalculationFn to SimApp

[anilcse]

Summary

Now with #10441, app developers have an option to set custom inflation function to override default mint module's infaltion calculation function.

We don't have any example implementations to make it easy for app developers to use it.

Proposal

Adding a simple ExampleInflationCalculationFn in SimApp would help the developers to use this feature reasily. If this makes SimApp heavy, atleast we should have some documentation explaining this.

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[facundomedica]

I think this can be solved via docs, as there's a default function that can be really helpful to look at:

cosmos-sdk/x/mint/types/genesis.go

Lines 14 to 17 in 40b5953

	// DefaultInflationCalculationFn is the default function used to calculate inflation.
	func DefaultInflationCalculationFn(_ sdk.Context, minter Minter, params Params, bondedRatio sdk.Dec) sdk.Dec {
	return minter.NextInflationRate(params, bondedRatio)
	}

Modifying the NextInflationRate section might be the way to go.
What do you think?

[anilcse]

I think this can be solved via docs, as there's a default function that can be really helpful to look at:

cosmos-sdk/x/mint/types/genesis.go

Lines 14 to 17 in 40b5953

	// DefaultInflationCalculationFn is the default function used to calculate inflation.
	func DefaultInflationCalculationFn(_ sdk.Context, minter Minter, params Params, bondedRatio sdk.Dec) sdk.Dec {
	return minter.NextInflationRate(params, bondedRatio)
	}

Modifying the NextInflationRate section might be the way to go. What do you think?

That sounds reasonable