refactor(x/bank,x/distr,x/feegrant)!: reduce auth keeper dependency

[facundomedica]

Description

This PR aims to reduce the dependency on x/auth, it tackles the low hanging fruit so make it easier later. Now we only use these functions from x/auth in x/bank:

GetAccount(ctx context.Context, addr sdk.AccAddress) sdk.AccountI
HasAccount(ctx context.Context, addr sdk.AccAddress) bool
SetAccount(ctx context.Context, acc sdk.AccountI)

GetModuleAddress(moduleName string) sdk.AccAddress
GetModuleAccount(ctx context.Context, moduleName string) sdk.ModuleAccountI
GetModulePermissions() map[string]types.PermissionsForAddress

And x/distribution:

GetModuleAddress(name string) sdk.AccAddress
GetModuleAccount(ctx context.Context, name string) sdk.ModuleAccountI

And was able to remove it completely from x/feegrant, so it's only breaking there. For the rest, some prepare work was done but I avoided doing any API breaking changes because in the future we'll need to break it again.

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[julienrbrt]

What was the reason for this and what does it mean to remove it?

[facundomedica]

A few lines above GetDistributionAccount is called, which calls GetModuleAccount, then GetModuleAccountAndPermissions which calls SetModuleAccount. So this is not needed