Use granite-embedding model for embeddings

[fbricon]

[fbricon]

saw this in the console:

[Extension Host] error when indexing: Error: Failed to generate embeddings for 920 chunks with provider: Ollama2::granite-embedding:278m::500: Error: HTTP 500 Internal Server Error from http://127.0.0.1:11434/api/embed

{"error":{}}
at LanceDbIndex.getEmbeddings (/Users/fbricon/.vscode/extensions/continue.continue-0.9.251-darwin-arm64/out/extension.js:223730:17)