Add Span overload for Socket.ReceiveMessageFrom

[geoffkizer]

We apparently missed this one in #938.

Proposed API

namespace System.Net.Sockets
{
 public partial class Socket : IDisposable
 {
 // existing: public int ReceiveMessageFrom(byte[] buffer, int offset, int size, ref System.Net.Sockets.SocketFlags socketFlags, ref System.Net.EndPoint remoteEP, out System.Net.Sockets.IPPacketInformation ipPacketInformation);

 public int ReceiveMessageFrom(Span<byte> buffer, ref System.Net.Sockets.SocketFlags socketFlags, ref System.Net.EndPoint remoteEP, out System.Net.Sockets.IPPacketInformation ipPacketInformation);
 }

Tagging subscribers to this area: @dotnet/ncl
See info in area-owners.md if you want to be subscribed.

[karelz]

Triage: Should be simple to do once the API is formally reviewed.

[bartonjs]

Video

Looks good as proposed

namespace System.Net.Sockets
{
 public partial class Socket : IDisposable
 {
 public int ReceiveMessageFrom(Span<byte> buffer, ref System.Net.Sockets.SocketFlags socketFlags, ref System.Net.EndPoint remoteEP, out System.Net.Sockets.IPPacketInformation ipPacketInformation);
 }
}