EndBlock hook

[blasrodri]

Is your feature request related to a problem? Please describe.
I need to have the guarantee that a transaction/function is called once per block, at the end of the block. This is useful specifically for a system that has to settle submitted orders within that specific block (latency matters).

Describe the solution you'd like
I'm looking to implement an entrypoint/hook that can delegate some work to a function and that's called at the end of each block.

Describe alternatives you've considered
Distribute the load in more than one block. It adds latency but also doesn't guarantee that another valid transaction on the block isn't skipped.

Additional context
none