Add HeightParam abstraction

[ljoss17]

Summary

Some queries use a Option<Height> in order to define if the query must be done using the latest height or a specific height. Following this discussion, #167 (comment), a HeightParam abstraction could be used to specify the strategy used regarding the query height.

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[romac]

Why not just define a enum?

#[derive(Default)]
enum QueryHeight<Height> {
  #[default]
  Latest,
  Specific(Height),
}

In general I would push for not abstracting things away that we have no need to abstract over for now.