Add Bunnymark example

[derpycoder]

It can teach a lot of things, for instance:

• GPU Instancing
• Bit Packing
• Fixed Update Loop
• Multithreading
• AoS
• SoA
• SIMD

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Currently the SIMD implementation is not performant. (i.e. simulate_soa_simd)

Also, the comments are not currently explaining all the things done in the code.

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Checklist before submitting:

• This example has been added to .github/workflows/check.yml (for automatic testing)
• This example compiles cleanly with flags -vet -strict-style -vet-tabs -disallow-do -warnings-as-errors
• This example follows the naming and style convention: https://github.com/odin-lang/examples/wiki/Naming-and-style-convention (exceptions can be made for ports of examples that need to match 1:1 to the original source).
• By submitting, I understand that this example is made available under these licenses: Public Domain and Odin's zlib license. Only for third-party dependencies are other licenses allowed.

[derpycoder]

Bill Hall commented in the forum, where I asked for help regarding SIMD, that:

I am using thread pool wrong and I don’t understand SIMD.

I will update the multithreading section with WaitGroups and learn SIMD before updating the PR.