consider adding matrix determinant

[dneto0]

The determinant function acts on any square matrix.

There is common support for square matrices over f32 components:

• SPIR-V: Use extended instruction GLSL.std.450 Determinant
• MSL has determinant standard library function
• HLSL has determinant builtin function.
• DXIL does not have direct support. I expect a simple polyfill is sufficient.

[kdashg]

WGSL meeting minutes 2021-04-13

• (yes, add it)

[alan-baker]

https://gpuweb.github.io/gpuweb/wgsl/#matrix-builtin-functions already lists it. Suggest we close this issue.

[dneto0]

It's been added.