Add option to use Perlin Noise

[pt20]

According to wikipedia

Perlin noise is a procedural texture primitive, a type of gradient noise used by visual effects artists to increase the appearance of realism in computer graphics. The function has a pseudo-random appearance, yet all of its visual details are the same size. This property allows it to be readily controllable; multiple scaled copies of Perlin noise can be inserted into mathematical expressions to create a great variety of procedural textures. Synthetic textures using Perlin noise are often used in CGI to make computer-generated visual elements – such as object surfaces, fire, smoke, or clouds – appear more natural, by imitating the controlled random appearance of textures in nature.

I feel adding Perlin noise would mean that fake GeoTIFFs can better resemble authentic geographic textures, making them more valuable for testing visualization tools or algorithms that expect natural-looking datasets.

https://github.com/razaekel/noise-rs has Perlin noise implemented. It'd be great to try it out.