fix: Fix returned Anthropic reasoning blocks - #455
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Preserve structured content blocks returned by Databricks chat models instead of JSON-serializing them.
This fixes Anthropic reasoning responses where the initial streamed chunk contains a structured reasoning block and subsequent chunks contain answer text. Previously, LangChain combined these into a mixed list:
Changes
[ reasoning_block, {"type": "text", "text": "answer text", "index": 1}, ]