gRPC JSON transcoding: Append values to collections

[JamesNK]

Use new System.Text.Json feature with gRPC JSON transcoding: dotnet/runtime#78556. Improve performance of deserializing collections.

[ghost]

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We're moving this issue to the .NET 8 Planning milestone for future evaluation / consideration. We would like to keep this around to collect more feedback, which can help us with prioritizing this work. We will re-evaluate this issue, during our next planning meeting(s).
If we later determine, that the issue has no community involvement, or it's very rare and low-impact issue, we will close it - so that the team can focus on more important and high impact issues.
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