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Full set of params are missing from Vertex* LLMs when `dict()` method is called. ``` >>> from langchain.chat_models.vertexai import ChatVertexAI >>> from langchain.llms.vertexai import VertexAI >>> chat_llm = ChatVertexAI() l>>> llm = VertexAI() >>> chat_llm.dict() {'_type': 'vertexai'} >>> llm.dict() {'_type': 'vertexai'} ``` This PR just uses the same mechanism used elsewhere to expose the full params. Since `_identifying_params()` is on the `_VertexAICommon` class, it should cover the chat and non-chat cases.