Happy Eyeballs support in Socket.ConnectAsync

[liveans]

This API has been proposed and approved on https://github.com/dotnet/runtime/issues/861. Since we're closing the mega-issue(https://github.com/dotnet/runtime/issues/33418) we'll track this here.

class Socket
{
    // existing: public static bool ConnectAsync(SocketType socketType, ProtocolType protocolType, SocketAsyncEventArgs e);
    public static bool ConnectAsync (SocketType socketType, ProtocolType protocolType, SocketAsyncEventArgs e, ConnectAlgorithm connectAlgorithm);
}

// new enum
enum ConnectAlgorithm
{
    // use existing behavior.
    Default,

    // use a Happy Eyeballs-like algorithm to connect.
    Parallel = 1
}

[ghost]

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Issue Details

---

This API has been proposed and approved on https://github.com/dotnet/runtime/issues/861. Since we're closing the mega-issue(https://github.com/dotnet/runtime/issues/33418) we'll track this here. ```c# class Socket { // existing: public static bool ConnectAsync(SocketType socketType, ProtocolType protocolType, SocketAsyncEventArgs e); public static bool ConnectAsync (SocketType socketType, ProtocolType protocolType, SocketAsyncEventArgs e, ConnectAlgorithm connectAlgorithm); } // new enum enum ConnectAlgorithm { // use existing behavior. Default, // use a Happy Eyeballs-like algorithm to connect. Parallel = 1 } ```

Author:	liveans
Assignees:	-
Labels:	`api-approved`, `area-System.Net.Sockets`
Milestone:	-

[wfurt]

related to #26177