remove Double#isFinite checks in Vec3 constructor

A performance analysis showed, that the Double#isFinite checks in the Vec3 constructor add significant overhead without providing much value to the application.

src/main/java/eu/jonahbauer/raytracing/math/Vec3.java

@@ -11,9 +11,7 @@ public record Vec3(double x, double y, double z) {
     public static final Vec3 UNIT_Z = new Vec3(0, 0, 1);
 
     public Vec3 {
-        if (!Double.isFinite(x) || !Double.isFinite(y) || !Double.isFinite(z)) {
-            throw new IllegalArgumentException("x, y and z must be finite");
-        }
+        assert Double.isFinite(x) && Double.isFinite(y) && Double.isFinite(z) : "x, y and z must be finite";
     }
 
     public static @NotNull Vec3 random() {