chore: add new query to return next block to be rewarded

[RafilxTenfen]

helps to debug

[KonradStaniec]

Wdyt about making this a metric ? (you can find example metrics in metrics.go)

It feel a bit weird to introduce whole query, without other use case than debugging.

[RafilxTenfen]

Wdyt about making this a metric ? (you can find example metrics in metrics.go)

It feel a bit weird to introduce whole query, without other use case than debugging.

ya, there is not much reason besides debugging, I don't think a metrics would be the right fit as the whole idea here would be to see some value that is inside the keeper

One other way of debugging this is to export genesis, but that requires stopping the node

I am good if we don't want this to be a query and we can close the PR