Refactor and enhance math and utility libraries

Refactored `sincos` usage across `quaternion` and `random` to use `out` parameters for improved performance. Enhanced `random` struct with updated random direction generation methods.

Added new benchmarks in `MathematicsBenchmark` for vector operations, including SIMD-based `f4` struct. Downgraded target framework to `net9.0` for compatibility.

Introduced `ReadOnlyUnsafeCollection` for low-level memory management. Added utility methods in `CollectionUtility` for span creation and optimized list operations.

Renamed `MemoryUtilities` to `MemoryUtility` and updated all references. Enhanced `ObjectPool` with `Rent` and `TryRent` methods. Enabled `AllowUnsafeBlocks` and AOT compatibility in project configuration.

Performed general code cleanup, including removal of unused methods, improved formatting, and alignment with modern coding practices.

Misaki.HighPerformance.Mathematics/Geometry/OBB.cs

@@ -94,7 +94,12 @@ public struct OBB : IEquatable<OBB>
 
     public readonly AABB ToAABB()
     {
-        var absRotation = math.abs(new float3x3(Rotation));
+        var absRotation = new float3x3
+        {
+            c0 = math.abs(Rotation.value.x),
+            c1 = math.abs(Rotation.value.y),
+            c2 = math.abs(Rotation.value.z)
+        };
         var worldExtents = absRotation.c0 * Extents.x + absRotation.c1 * Extents.y + absRotation.c2 * Extents.z;
         return new AABB(Center - worldExtents, Center + worldExtents);
     }