* feat:add Xinference rerank provider
* feat:add default rerank_api_key option for Xinference provider
* style: format code
* fix: refactor XinferenceRerankProvider initialization for better error handling
* fix: update XinferenceRerankProvider to use async client methods for initialization and reranking
* feat: add launch_model_if_not_running option to XinferenceRerankProvider for better control over model initialization
* chore: remove unused asyncio import from xinference_rerank_source.py