Rysweet 5207 net runtime interface to match python add registration to interface and inmemoryruntime

[rysweet]

• add Registry abstractions and Registry Storage to Core/Contracts
• brings Grpc in line with these abstractions
• add registeragenttype to in memory runtime. Note it's not necessary to call this because we register all the agents with reflection unless you tell the runtime not to.....

Why are these changes needed?

Bringing the .NET more in line with the python

Related issue number

close #5207

Checks

• I've included any doc changes needed for https://microsoft.github.io/autogen/. See https://microsoft.github.io/autogen/docs/Contribute#documentation to build and test documentation locally.
• I've added tests (if relevant) corresponding to the changes introduced in this PR.
• I've made sure all auto checks have passed.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.08%. Comparing base (e582072) to head (4e92ec2).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5215   +/-   ##
=======================================
  Coverage   70.08%   70.08%           
=======================================
  Files         179      179           
  Lines       11619    11619           
=======================================
  Hits         8143     8143           
  Misses       3476     3476           

Flag	Coverage Δ
unittests	70.08% <ø> (ø)

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[Copilot]

Copilot reviewed 12 out of 27 changed files in this pull request and generated 5 comments.

Files not reviewed (15)

• dotnet/.editorconfig: Language not supported
• dotnet/samples/Hello/HelloAgent/registry.json: Language not supported
• dotnet/src/Microsoft.AutoGen/Core/IAgentRuntime.cs: Evaluated as low risk
• dotnet/src/Microsoft.AutoGen/Contracts/IAgent.cs: Evaluated as low risk
• dotnet/src/Microsoft.AutoGen/Runtime.Grpc/Abstractions/IGatewayRegistry.cs: Evaluated as low risk
• dotnet/src/Microsoft.AutoGen/Runtime.Grpc/Abstractions/IRegistryGrain.cs: Evaluated as low risk
• dotnet/src/Microsoft.AutoGen/Runtime.Grpc/Services/Grpc/GrpcGateway.cs: Evaluated as low risk
• dotnet/src/Microsoft.AutoGen/Core.Grpc/GrpcAgentRuntime.cs: Evaluated as low risk
• dotnet/src/Microsoft.AutoGen/Core/UninitializedAgentWorker.cs: Evaluated as low risk
• dotnet/src/Microsoft.AutoGen/Core/HostBuilderExtensions.cs: Evaluated as low risk
• dotnet/src/Microsoft.AutoGen/Core/Agent.cs: Evaluated as low risk
• dotnet/src/Microsoft.AutoGen/Core.Grpc/GrpcAgentWorkerHostBuilderExtension.cs: Evaluated as low risk
• dotnet/src/Microsoft.AutoGen/Core/AgentRuntime.cs: Evaluated as low risk
• dotnet/src/Microsoft.AutoGen/Core/AgentRuntimeBase.cs: Evaluated as low risk
• dotnet/src/Microsoft.AutoGen/Contracts/IRegistry.cs: Evaluated as low risk

Comments suppressed due to low confidence (5)

dotnet/src/Microsoft.AutoGen/Core/Registry.cs:41

• The use of '[]' to initialize collections is not valid C# syntax. It should be corrected to 'new List()'.

agents.AddRange(eventHandlingAgents.ToList());

dotnet/src/Microsoft.AutoGen/Core/Registry.cs:45

• The use of '[]' to initialize collections is not valid C# syntax. It should be corrected to 'new List()'.

agents.AddRange(combo.ToList());

dotnet/src/Microsoft.AutoGen/Core/Registry.cs:57

• The use of '[]' to initialize collections is not valid C# syntax. It should be corrected to 'new List()'.

agents.Add(agentType);

dotnet/src/Microsoft.AutoGen/Core/Registry.cs:106

• The method 'WriteStateAsync' should be awaited to ensure proper async operation.

return await WriteStateAsync(State, cancellationToken).ConfigureAwait(false);

dotnet/src/Microsoft.AutoGen/Contracts/IAgentRuntime.cs:33

• The method RuntimeSendRequestAsync has a comment indicating it will be removed in favor of send_message. This is confusing and should be clarified or removed.

ValueTask RuntimeSendRequestAsync(IAgent agent, RpcRequest request, CancellationToken cancellationToken = default);