Review gateway types post v0.13.2

[Mirko-von-Leipzig]

Starknet v0.13.0, v0.13.1 and v0.13.2 introduced several new block header fields, which we've made optional in our DTOs in order to support the version transitions.

Once all networks have deployed v0.13.2 we should review these fields and drop the optional if the fields are also present in the historical block data. i.e. if the new fields are also present for genesis block then we don't need the optional.