[Epic] Enhancing Bedrock Abstractions

[analogrelay]

This is tracking the work to align our servers and SignalR client APIs with a proposed new socket abstraction. See #10308 for a detailed description (that issue was originally tracking this work before this epic was created).

New abstraction shape:

public abstract class ConnectionContext : IAsyncDisposable
{
  // unchanged except for IAsyncDisposable base
}

public interface IConnectionListenerFactory
{
    ValueTask<IConnectionListener> BindAsync(System.Net.EndPoint endpoint, CancellationToken cancellationToken = default);
}

public interface IConnectionListener : IAsyncDisposable
{
    EndPoint EndPoint { get; }
    ValueTask<ConnectionContext> AcceptAsync(CancellationToken cancellationToken = default);
    ValueTask UnbindAsync(CancellationToken cancellationToken = default);
}

public interface IConnectionFactory
{
    ValueTask<ConnectionContext> ConnectAsync(System.Net.EndPoint endpoint, CancellationToken cancellationToken = default);
}

Child Items

• Client/server networking abstractions #10308 Client/server networking abstractions (covers the server-side work)
• Adopt Bedrock Client abstractions in SignalR client #10872 Adopt new Bedrock abstractions in SignalR Client.
• Implement IAsyncDisposable in Connection.Abstractions #10607 Implement IAsyncDisposable in Connection.Abstractions (a bit tangental but related enough)
• Convert Https connection adapter to connection middleware #4623 Convert https connection adapter to connection middleware

[davidfowl]

If new things come up we'll file new issues.