Style spec parity

MapLibre GL JS and MapLibre Native implement the style spec at different paces. Properties on shared layer types stay in the common API, with unsupported writes filtered by StyleBinding. A whole layer type that only one engine accepts has its composable in that engine's source set.

mise run style-spec:parity reads v8.json at the pinned maplibre-style-spec release and compares it with every Main source set that writes a layer or source.

mise run style-spec:parity
mise run style-spec:parity -- --check
mise run style-spec:parity -- --spec /path/to/v8.json