feat: add async delete support

chore: add docstrings for indexes and routers

fix: pinecone init logic

feat: Add Pinecone Local Index support and update dependencies

- Set X-Pinecone-API-Version header for cloud API endpoints
- Ensure compatibility with Pinecone's latest API versioning

- Refactor base URL assignment to prioritize environment variable
- Ensure consistent base URL configuration for Pinecone index
- Maintain existing logging behavior for remote API usage

Merge branch 'anup/pinecone-local' of https://github.com/aurelio-labs/semantic-router into anup/pinecone-local

- Update PineconeIndex to handle both local and cloud Pinecone index configurations
- Add base_url default to Pinecone cloud API
- Improve logging for base URL selection
- Update documentation notebook to reflect new configuration approach