This commit introduces embedding functionality to the llamacpp extension. It allows users to generate embeddings for text inputs using the 'sentence-transformer-mini' model. The changes include:
- Adding a new `embed` method to the `llamacpp_extension` class.
- Implementing model loading and API interaction for embeddings.
- Handling potential errors during API requests.
- Adding necessary types for embedding responses and data.
- The load method now accepts a boolean parameter to determine if it should load embedding model.
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