docs: Adding notebook for cdp agentkit toolkit (#27910)
- **Description:** Adding in the first pass of documentation for the CDP
Agentkit Toolkit
- **Issue:** N/a
- **Dependencies:** cdp-langchain
- **Twitter handle:** @CoinbaseDev
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Co-authored-by: Erick Friis <erick@langchain.dev>
Co-authored-by: John Peterson <john.peterson@coinbase.com>
