LlamaIndex Ollama Embeddings

The `llama-index-embeddings-ollama` library provides an integration for LlamaIndex to use embedding models served via Ollama. It allows developers to leverage local or self-hosted open-source models for text embeddings within their LlamaIndex applications. The current version is `0.9.0` and it generally follows the release cadence of the main `llama-index-core` library, receiving frequent updates.