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**Description** This PR sets the "caller identity" of the Astra DB clients used by the integration plugins (`AstraDBChatMessageHistory`, `AstraDBStore`, `AstraDBByteStore` and, pending #17767 , `AstraDBVectorStore`). In this way, the requests to the Astra DB Data API coming from within LangChain are identified as such (the purpose is anonymous usage stats to best improve the Astra DB service).