feat: add response headers to message metadata#511
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In the on_llm_end callback, we need to read response headers from LLM Gateway and add them to the usage span attribute.
To access the headers, they must be added to the AIMessage's response_metadata dict.
ChatBedrockConverseandAzureChatOpenAialready store the response headers in this dict, either by default or when a flag is enabled.ChatGenerativeGoogleAiandChatBedrockdo not. This PR adds a HeaderCapture utility that can store a header value in a context var and apply it to a ChatResult's message response_metadata.Tested with all providers.