[API Proposal]: SVE: Rename loadxX() to LoadVectorxXAndUnzip()

[a74nh]

#97831 approved the following:

namespace System.Runtime.Intrinsics.Arm

/// VectorT Summary
public abstract class Sve : AdvSimd /// Feature: FEAT_SVE  Category: loads
{
    /// T: float, double, sbyte, short, int, long, byte, ushort, uint, ulong
    public static unsafe (Vector<T>, Vector<T>) LoadVectorx2(Vector<T> mask, T* address); // LD2W or LD2D or LD2B or LD2H

    /// T: float, double, sbyte, short, int, long, byte, ushort, uint, ulong
    public static unsafe (Vector<T>, Vector<T>, Vector<T>) LoadVectorx3(Vector<T> mask, T* address); // LD3W or LD3D or LD3B or LD3H

    /// T: float, double, sbyte, short, int, long, byte, ushort, uint, ulong
    public static unsafe (Vector<T>, Vector<T>, Vector<T>, Vector<T>) LoadVectorx4(Vector<T> mask, T* address); // LD4W or LD4D or LD4B or LD4H
}

The following was implemented:

namespace System.Runtime.Intrinsics.Arm

/// VectorT Summary
public abstract class Sve : AdvSimd /// Feature: FEAT_SVE  Category: loads
{
    /// T: float, double, sbyte, short, int, long, byte, ushort, uint, ulong
    public static unsafe (Vector<T>, Vector<T>) LoadVectorx2AndUnzip(Vector<T> mask, T* address); // LD2W or LD2D or LD2B or LD2H

    /// T: float, double, sbyte, short, int, long, byte, ushort, uint, ulong
    public static unsafe (Vector<T>, Vector<T>, Vector<T>) LoadVectorx3AndUnzip(Vector<T> mask, T* address); // LD3W or LD3D or LD3B or LD3H

    /// T: float, double, sbyte, short, int, long, byte, ushort, uint, ulong
    public static unsafe (Vector<T>, Vector<T>, Vector<T>, Vector<T>) LoadVectorx4AndUnzip(Vector<T> mask, T* address); // LD4W or LD4D or LD4B or LD4H
}

This was done to follow the existing LoadNxVectorNAndUnzip() APIs in AdvSimd.

This issue is to approve the implemented API.

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