Fix custom code AOT compatibility

[m-nash]

Changes MRW calls to use the AOT safe version in custom code.

[Copilot]

Pull Request Overview

This PR updates ModelReaderWriter method calls throughout the codebase to use AOT-compatible overloads by explicitly passing ModelReaderWriterOptions.Json and OpenAIContext.Default parameters, ensuring compatibility with Ahead-of-Time compilation scenarios.

Key changes:

• Updated all ModelReaderWriter.Write() calls to include explicit options and context parameters
• Updated all ModelReaderWriter.Read<T>() calls to include explicit options and context parameters

Reviewed Changes

Copilot reviewed 17 out of 17 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/Utility/CustomSerializationHelpers.cs	Updated serialization helper to use AOT-safe ModelReaderWriter.Write overload
src/Custom/VectorStores/Internal/Pagination/VectorStoreCollectionResult.cs	Updated deserialization to use AOT-safe ModelReaderWriter.Read overload
src/Custom/VectorStores/Internal/Pagination/AsyncVectorStoreCollectionResult.cs	Updated async deserialization to use AOT-safe ModelReaderWriter.Read overload
src/Custom/Responses/Pagination/Internal/ResponseItemCollectionResult.cs	Updated response item deserialization to use AOT-safe ModelReaderWriter.Read overload
src/Custom/Responses/Pagination/Internal/AsyncResponseItemCollectionResult.cs	Updated async response item deserialization to use AOT-safe ModelReaderWriter.Read overload
src/Custom/Realtime/Streaming/RealtimeUpdate.cs	Updated raw content serialization to use AOT-safe ModelReaderWriter.Write overload
src/Custom/Realtime/RealtimeSession.cs	Updated multiple serialization and deserialization points to use AOT-safe ModelReaderWriter overloads
src/Custom/Realtime/Internal/InternalRealtimeResponseSession.cs	Updated property setter serialization to use AOT-safe ModelReaderWriter.Write overload
src/Custom/Realtime/ConversationSessionOptions.cs	Updated property setters to use AOT-safe ModelReaderWriter.Write overload
src/Custom/Realtime/ConversationResponseOptions.cs	Updated property setters to use AOT-safe ModelReaderWriter.Write overload
src/Custom/FineTuning/Internal/Pagination/FineTuningEventCollectionResult.cs	Updated event deserialization to use AOT-safe ModelReaderWriter.Read overload
src/Custom/FineTuning/Internal/Pagination/FineTuningCheckpointCollectionResult.cs	Updated checkpoint deserialization to use AOT-safe ModelReaderWriter.Read overload
src/Custom/FineTuning/Internal/Pagination/AsyncFineTuningEventCollectionResult.cs	Updated async event deserialization to use AOT-safe ModelReaderWriter.Read overload
src/Custom/FineTuning/Internal/Pagination/AsyncFineTuningCheckpointCollectionResult.cs	Updated async checkpoint deserialization to use AOT-safe ModelReaderWriter.Read overload
src/Custom/FineTuning/FineTuningTrainingMethod.cs	Updated hyperparameter serialization to use AOT-safe ModelReaderWriter.Write overload
src/Custom/FineTuning/FineTuningClient.cs	Updated job deserialization to use AOT-safe ModelReaderWriter.Read overload
src/Custom/Assistants/AssistantResponseFormat.cs	Updated ToString() serialization to use AOT-safe ModelReaderWriter.Write overload

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[joseharriaga]

I suspect that the following four internal classes edited in this PR are actually not used anymore, and that they are leftovers from a previous PR where they should have been deleted instead:

• ResponseItemCollectionResult
• AsyncResponseItemCollectionResult
• VectorStoreCollectionResult
• AsyncVectorStoreCollectionResult