Add phi to the public nodes

[juntao]

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[juntao]

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Commit 5d901b4267426c81c9fdba9811ad152ec5b65d14

1. Added a new node called "Phi" which runs a plain Phi 3 mini model without any additional knowledge.
2. The Phi node can be interacted with via a chatbot interface or used in another application by replacing the OpenAI configuration.
3. To use the Phi node in an app, replace the API endpoint URL with "https://phi.us.gaianet.network/v1", Model Name (for LLM) with "phi", and Model Name (for Text embedding) with "nomic-embed". The API key can be left empty or any value can be used.
4. No changes were made to the existing nodes ("Llama" and "Gemma").