Support pitch expressions in paint & layout properties

Nobody has claimed this yet.

## Motivation

As a user I would like to translate POI icons based on pitch value. So if a map would be pitched, I could for example translate features based on the pitch. This could help to achieve something like this:

(Image from @willymaps)

So like in this example, but instead of turning the labels on/off, I would like to see a smooth transition of the labels moving. In my case they would be moving upwards, with an increased -Y offset, which I could achieve with an expression if I could use the pitch property value.

cc: @tristen

Start by reviewing how paint and layout expressions currently access map properties, with attention to the pitch value and the requested POI label offset behavior. Done means expressions can use pitch to produce a smooth transition, such as moving labels upward as the map pitch increases.

Written by the indexing model from the issue text.