Add migration logic to tokenfactory module

[sunnya97]

Need to initialize the storekey for the tokenfactory module for when doing an in-place migration. Required for next upgrade.

[sunnya97]

@ValarDragon @alexanderbez do you know how I'm supposed to do this? Is there an example somewhere?

[alexanderbez]

What exactly do you mean by "initialize the store key"? Do you mean just simply adding a new module during an upgrade?

[ValarDragon]

https://github.com/osmosis-labs/osmosis/blob/main/app/app.go#L407-L411

[alexanderbez]

Seems pretty straight forward

[sunnya97]

Added into #1362