Don't error on Protobuf messages that expose wrapper types

[JamesNK]

Fixes #55254

Add logic to convert to and from wrapper types when they're exposed on Protobuf DTOs.

Note that the Protobuf DTO class is added directly instead of code genned. This is done because code gen in this project wouldn't expose the wrapper types.

[Copilot]

Pull Request Overview

This PR adds support for Protobuf wrapper types in gRPC JSON transcoding by implementing conversion logic to handle scenarios where wrapper types are directly exposed on DTOs rather than their underlying primitive types.

• Adds detection and conversion logic for wrapper types (StringValue, Int32Value, etc.) in the JSON transcoding infrastructure
• Includes new test coverage for reading and writing JSON with wrapper type properties
• Adds a generated WrappersMessage test class to support the new functionality

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 4 comments.

File	Description
WrappersMessage.cs	Generated Protobuf message class containing all wrapper types for testing
JsonConverterWriteTests.cs	Adds test for serializing wrapper types to JSON
JsonConverterReadTests.cs	Adds test for deserializing JSON to wrapper types
MessageTypeInfoResolver.cs	Core implementation for detecting and converting wrapper types during serialization/deserialization

[JamesNK]

/azp run

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