Handle additional x/auth module app config parameters

[aaronc]

In #12019, we didn't add configuration parameters for:

• func() types.AccountI which is a parameter for NewAccountKeeper, and
• types.RandomGenesisAccountsFn which is a parameter to auth.NewModule

I propose we handle these with google.protobuf.Any in the auth Module config object.

The question is, how do we actually map the Any to the function? Since these now live in the API module do we take an approach similar to that outlined here: https://github.com/cosmos/cosmos-sdk/blob/963bbae8b190df8743196005a43158277a9954c8/core/extension/extension.go

[julienrbrt]

In #13684 I simply add the function in depinject.Supply. This is not ideal (we do the same for mint), but that still let a chain dev to modify the value. We can always increment on it later with Any I think.

[aaronc]

I'm not seeing an example in that PR yet, but I think using depinject.Supply is an okay compromise for now 👍