Use protocol.abstractions primitives instead of socket abstractions (#1432)

build/dependencies.props

client-ts/FunctionalTests/EchoEndPoint.cs

samples/SocialWeather/PersistentConnectionLifeTimeManager.cs

samples/SocialWeather/SocialWeatherEndPoint.cs

samples/SocketsSample/EndPoints/MessagesEndPoint.cs

samples/SocketsSample/Program.cs

...Microsoft.AspNetCore.SignalR.Core/HubConnectionContext.cs

src/Microsoft.AspNetCore.SignalR.Core/HubEndPoint.cs

...AspNetCore.SignalR.Core/SignalRSocketBuilderExtensions.cs

...soft.AspNetCore.Sockets.Abstractions/ConnectionBuilder.cs

...soft.AspNetCore.Sockets.Abstractions/ConnectionContext.cs

src/Microsoft.AspNetCore.Sockets.Abstractions/DuplexPipe.cs

...crosoft.AspNetCore.Sockets.Abstractions/ISocketBuilder.cs

...ractions/Microsoft.AspNetCore.Sockets.Abstractions.csproj

...spNetCore.Sockets.Abstractions/SocketBuilderExtensions.cs

...crosoft.AspNetCore.Sockets.Abstractions/SocketDelegate.cs

...spNetCore.Sockets.Http/HttpConnectionContextExtensions.cs

...osoft.AspNetCore.Sockets.Http/HttpConnectionDispatcher.cs

src/Microsoft.AspNetCore.Sockets.Http/SocketRouteBuilder.cs

src/Microsoft.AspNetCore.Sockets/ConnectionList.cs