Add Blue Planet area and mountain assets

Introduces new materials, shader, and prefabs for mountains and crystals. Adds the Blue Planet area scene, terrain, lighting, and associated textures and layers. Removes old terrain asset and updates relevant prefabs and materials to support the new environment.

Author: EnesEfeTokta

Red Strike/Assets/Free Demo of Low Poly Space Alien Worlds 3D Asset Pack/MountainMaterial_1.mat

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