Rysweet 4679 move grpc to runtimegrpc project

[rysweet]

Why are these changes needed?

creating dependency separation of core from the services... will make testing and refactoring easier.

Related issue number

closes #4679

Checks

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Copilot reviewed 51 out of 66 changed files in this pull request and generated no suggestions.

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• dotnet/samples/Hello/HelloAIAgents/HelloAIAgents.csproj: Language not supported
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• dotnet/samples/Hello/HelloAgentState/HelloAgentState.csproj: Language not supported
• dotnet/samples/dev-team/DevTeam.Agents/Developer/Developer.cs: Evaluated as low risk
• dotnet/samples/Hello/HelloAgent/README.md: Evaluated as low risk
• dotnet/samples/dev-team/DevTeam.Backend/Agents/AzureGenie.cs: Evaluated as low risk
• dotnet/samples/Hello/protos/agent_events.proto: Evaluated as low risk
• dotnet/samples/Hello/HelloAgentState/Program.cs: Evaluated as low risk
• dotnet/samples/dev-team/DevTeam.Agents/ProductManager/ProductManager.cs: Evaluated as low risk
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• dotnet/samples/dev-team/DevTeam.Backend/Agents/Sandbox.cs: Evaluated as low risk

[lokitoth]

Looks good overall; I want to examine the idea to remove the IMessage dependency from Agent's PublishMessageAsync(), but I'll put that in a separate issue: #4695