math backend setup

setup libraries for different simd isa's
add float4 functions for c sse2 and avx2 (placeholder file for neon to be implemented on mac)

Engine/source/math/public/float4_dispatch.cpp

@@ -0,0 +1,7 @@
+#include "math/public/float4_dispatch.h"
+
+namespace math_backend::float4::dispatch
+{
+   // Single definition of the global dispatch table
+   Float4Funcs gFloat4{};
+}