Add ColorReliefLayer (gl-js 5.6)

[ciscorn]

• Hypsometric Tint from terrain-RGB tiles maplibre/maplibre-gl-js#5742
• Hypsometric Tint from terrain-RGB tiles maplibre/maplibre-gl-js#5913
• style spec: https://maplibre.org/maplibre-style-spec/layers/#color-relief

Tasks

• Add <ColorReliefLayer />
• Add an example