Prepare 2.2.0-beta.2 release (Part 1)

[joseharriaga]

• Fixed a bug that caused CompleteChatStreaming*() with audio-enabled models to fail unless provided a ChatCompletionOptions instance that had previously been used for a non-streaming CompleteChat()* call
• Addressed an issue that caused calls to CompleteChatStreaming*() to not report usage when provided a ChatCompletionOptions instance that was previously used in a non-streaming CompleteChat*() call
• Addressed issues with standalone serialization and deserialization of ChatCompletionOptions that impacted the ability to manipulate chat completion requests via System.ClientModel.Primitives.ModelReaderWriter and related utilities