Block data exposed to App: follow #8216 and take the parts still missing (mainly FinalizeBlock)

In v0.36.x we decided to not expose the whole block header to the application. We did some due diligence to find out which fields where used by the SDK, ibc-go, and gaia; and made only those fields available via ABCI. See this comment for details on the due diligence.

We need to make sure that work is kept in the current implementation.