Simple fluid simulation example

[ekarademir]

This PR adds a simple fluid simulation example using Daniel Shiffman's Coding Train challenge.

Fluid simulation code is nearly one-to-one port, but it also uses Vulkan to draw the density image by converting density matrix to a Vulkan image on the fly. Also it uses Perlin noise to generate velocity vectors.

[mitchmindtree]

So sorry it's taken so long to get back to you @ekarademir ! This somehow totally slipped by me! Thanks so much, this looks like an awesome addition :)

I should have landed this before diving into #452, but alas that ship has sailed. I'm hoping I'll get a chance to rebase your work here and port it to use the new wgpu graphics backend as I still think it makes for a super nice custom pipeline example. That is, unless someone else reading this would like to have a go!

[ekarademir]

@mitchmindtree No worries. I can rebase it and also update it to use wgpu. It would be a nice excuse for me to dabble in with the new stuff.

[mitchmindtree]

That would be amazing! Feel free to ping me when you're ready and I'll prioritise testing and merging this.