Add support for pointerevents

https://docs.mapbox.com/mapbox-gl-js/api/map/#map-events
https://developer.mozilla.org/en-US/docs/Web/API/PointerEvent

## Motivation

Simplify such use cases, where you need to handle both, mouse and touch events: https://docs.mapbox.com/mapbox-gl-js/example/drag-a-point/

### Implementation

`map.on('pointerdown', ...`

Start with the map.on('pointerdown', ...) entry point and review the linked Mapbox GL JS map-events documentation alongside the MDN PointerEvent reference. Trace how mouse and touch events are handled, then verify that pointer events support the same use cases without requiring separate handlers.

Written by the indexing model from the issue text.