Make the FrameworkServices brokered services NativeAOT ready

[AArnott]

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[Copilot]

Pull Request Overview

This pull request migrates framework services from ServiceJsonRpcDescriptor (System.Text.Json) to ServiceJsonRpcPolyTypeDescriptor (PolyType-based serialization) for improved AOT compatibility and performance. The changes introduce source-generated RPC contracts and remove dynamic code requirements.

• Migrates core framework services (IRemoteServiceBroker, IAuthorizationService, IBrokeredServiceManifest, IMissingServiceDiagnosticsService) to use PolyType-based serialization with source generation
• Adds the experimental UTF8 formatter to ServiceJsonRpcPolyTypeDescriptor for JSON serialization via PolyType
• Removes RequiresUnreferencedCode and RequiresDynamicCode attributes from multiple APIs now that they support AOT compilation

Reviewed Changes

Copilot reviewed 30 out of 31 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/Microsoft.ServiceHub.Framework/FrameworkServices.cs	Migrates core service descriptors to use ServiceJsonRpcPolyTypeDescriptor with PolyType source generation; adds assembly-level RPC contract export attribute and source generation context
src/Microsoft.ServiceHub.Framework/ServiceJsonRpcPolyTypeDescriptor.cs	Adds experimental UTF8 formatter enum value and corresponding formatter creation method; adds RpcTargetMetadata property copying in copy constructor
src/Microsoft.ServiceHub.Framework/IRemoteServiceBroker.cs	Adds JsonRpcContract and GenerateShape attributes; changes to partial interface for source generation support
src/Microsoft.ServiceHub.Framework/Services/IAuthorizationService.cs	Adds JsonRpcContract and GenerateShape attributes; changes to partial interface for source generation support
src/Microsoft.ServiceHub.Framework/Services/IBrokeredServiceManifest.cs	Adds JsonRpcContract and GenerateShape attributes; changes to partial interface for source generation support
src/Microsoft.ServiceHub.Framework/Container/IMissingServiceDiagnosticsService.cs	Adds JsonRpcContract and GenerateShape attributes; changes to partial interface for source generation support
src/Microsoft.ServiceHub.Framework/Container/GlobalBrokeredServiceContainer.cs	Updates MissingServiceDiagnostics descriptor to use ServiceJsonRpcPolyTypeDescriptor with PolyType type shape provider; updates RequiresUnreferencedCode attribute reason from Formatters to TypeLoad
src/Microsoft.ServiceHub.Framework/Container/MissingServiceAnalysis.cs	Changes constructor visibility from internal to public to support serialization
src/Microsoft.ServiceHub.Framework/RemoteServiceBroker.cs	Removes RequiresUnreferencedCode and RequiresDynamicCode attributes from connection methods
src/Microsoft.ServiceHub.Framework/MultiplexingRelayServiceBroker.cs	Removes RequiresUnreferencedCode and RequiresDynamicCode attributes from ConnectToServerAsync
src/Microsoft.ServiceHub.Framework/ServiceBrokerClientMetadata.cs	Updates to use generic JsonStringEnumConverter<T> for better type safety and performance
src/Microsoft.ServiceHub.Framework/ServiceMoniker.cs	Adds ConstructorShape attribute; removes unused System.Diagnostics.CodeAnalysis import
src/Microsoft.ServiceHub.Framework/ServiceHub/LazyAuthorizationServiceProxy.cs	Removes RequiresUnreferencedCode and RequiresDynamicCode attributes
src/Microsoft.ServiceHub.Framework/DelegatingServiceJsonRpcPolyTypeDescriptor.cs	Removes RequiresUnreferencedCode and RequiresDynamicCode attributes
src/Microsoft.ServiceHub.Framework/Container/ServiceBrokerOfExportedServices.cs	Removes RequiresUnreferencedCode and RequiresDynamicCode attributes
src/Microsoft.ServiceHub.Framework/Container/GlobalBrokeredServiceContainer.View.cs	Adds RequiresUnreferencedCode(Reasons.TypeLoad) attribute
src/Microsoft.ServiceHub.Framework/Container/GlobalBrokeredServiceContainer.ProfferedViewIntrinsicService.cs	Updates RequiresUnreferencedCode attribute reason from Formatters to TypeLoad
src/Microsoft.ServiceHub.Framework/Container/GlobalBrokeredServiceContainer.ProfferedServiceFactory.cs	Updates RequiresUnreferencedCode attribute reason from Formatters to TypeLoad
src/Microsoft.ServiceHub.Framework/Container/GlobalBrokeredServiceContainer.ProfferedRemoteServiceBroker.cs	Moves RequiresUnreferencedCode attribute from class to constructor
src/Microsoft.ServiceHub.Framework/Extensions/ServiceManagerReflectionHelpers.cs	Updates RequiresUnreferencedCode attribute reason and removes RequiresDynamicCode
src/Microsoft.ServiceHub.Framework/Reflection/ProxyBase.cs	Clarifies error message to specify "local services" for missing source-generated proxies
src/Microsoft.ServiceHub.Framework/Reasons.cs	Removes unused CloseGenerics constant
src/Microsoft.ServiceHub.Framework/Microsoft.ServiceHub.Framework.csproj	Adds analyzer references via AnalyzerUser.targets; adds NoWarn for ISB001
src/AnalyzerUser.targets	New file defining analyzer project references for use by both src and test projects
test/Microsoft.ServiceHub.Framework.Tests/RemoteServiceBrokerFrameworkDescriptorTests.cs	Updates tests to verify ServiceJsonRpcPolyTypeDescriptor usage and UTF8 formatter; adds #pragma warning disable PolyTypeJson
test/Microsoft.ServiceHub.Framework.Tests/RemoteServiceBrokerTests.cs	Updates cast from ServiceJsonRpcDescriptor.JsonRpcConnection to ServiceJsonRpcPolyTypeDescriptor.JsonRpcConnection
test/Microsoft.ServiceHub.Framework.Tests/MissingServiceDiagnosticsTests.cs	New test file for IMissingServiceDiagnosticsService RPC serialization
test/Microsoft.ServiceHub.Framework.Tests/Mocks/MockMissingServiceDiagnosticsService.cs	New mock implementation for IMissingServiceDiagnosticsService tests
test/Microsoft.ServiceHub.Framework.Tests/Microsoft.ServiceHub.Framework.Tests.csproj	Updates import path from test\AnalyzerUser.targets to src\AnalyzerUser.targets
Microsoft.ServiceBroker.slnx	Moves AnalyzerUser.targets from test to src folder
Directory.Packages.props	Updates StreamJsonRpc from version 2.24.45-preview to 2.24.51-preview