[Feature] Query data from a fixed amount of blocks before latest

Description

A nice DevX improvement would be to allow querying for data in a way akin to this

query {
  someEntity(block: {
    number: -100
  }) {
    # fields ...
  }
}

This query would fetch data at block latest - 100.

The rationale here is that a very common use case is to fetch data at a fixed amount of blocks prior to the tip to avoid data inconsistencies due to chain reorgs (or, in other words, to ensure data finality). AFAIK, right now the only way to do that is to first query the latest indexed block, and then perform the desired query at latest - n, which is cumbersome and repetitive.

Are you aware of any blockers that must be resolved before implementing this feature? If so, which? Link to any relevant GitHub issues.

No response

Some information to help us out

• Tick this box if you plan on implementing this feature yourself.
• I have searched the issue tracker to make sure this issue is not a duplicate.

No se nombran archivos ni tests. Empieza rastreando el manejo existente de los argumentos de bloque en GraphQL y el mecanismo utilizado para obtener el bloque indexado más reciente. Confirma cómo debe resolverse un número de bloque negativo en relación con el tip y cómo se gestiona la finalización de los reorgs; el trabajo estará terminado cuando la consulta de ejemplo funcione sin una solicitud separada del bloque más reciente y esté cubierta por tests.