SignalR Hub Example Update to 7 plus add Hub Client Results

[wadepickett]

------ Collaborative Work In Progress while in draft ------

Contributes to

• dotnet/AspNetCore.Docs#27996
• dotnet/AspNetCore.Docs#28459

Changes from existing 6.x version:

• Updated to .NET 7 from scratch so it has the latest js libraries, templates, etc.
• Added ChatHubClientResults.cs to the hub snippet examples provided by serpent5 last 7/2022.

[wadepickett]

@BrennanConroy,

Could you help me with the 3 Client Results hub classes for our standard hubs SingalRChat sample? This Client Results section of this doc: [Use hubs in SignalR for ASP.NET Core]{https://learn.microsoft.com/en-us/aspnet/core/signalr/hubs?view=aspnetcore-7.0#client-results} has 3 include code samples that are generalized, but I need to move them into compilable/usable snippets here. Then I can link the updated snippets back the doc.

The 3 Client Results hub samples are here in this PR:

1. SignalRHubsSample\Snippets\Hubs\ChatHubClientResults.cs
2. SignalRHubsSample\Snippets\Hubs\ChatHubClientResultsContext.cs
3. SignalRHubsSample\Snippets\Hubs\ChatHubClientResultsStronglyTyped.cs

Sorry to ask, I have been trying to work out the intent of how client results work but I'm not up to speed enough on SignalR to pull it off.

[wadepickett]

closing and reopening to run checks again