x/pool-incentives: Make FundCommunityPoolFromModule call distr.FundCommunityPool

[ValarDragon]

The current FundCommunityPoolFromModule function in pool-incentives should either be upstreamed to the SDK's distribution module, or we should derive the SDK address for this, and call distr.FundCommunityPool.

We derive the SDK address from a module name via:

addr := k.accountKeeper.GetModuleAddress(moduleName)
if addr == nil {
  error or panic
}

[alexanderbez]

@ValarDragon what exactly are you proposing we upstream to x/distribution?

[ValarDragon]

The FundCommunityPoolFromModule function as a whole. The problem we faced was we wanted to send coins to the community pool from a module account, and in this code we basically hackily did updates to the Distr.FeeTokens struct to handle this.

[alexanderbez]

Got it! Shouldn't this issue exist in the SDK then?

[ValarDragon]

Oh true. I guess its a yak shaving question of do we want to get this into the SDK, versus just use more black box functionality here. (converting sending address to a normal address rather than module address)