community[minor]: migrate bigdl-llm to ipex-llm (#19518)

- **Description**: `bigdl-llm` library has been renamed to
[`ipex-llm`](https://github.com/intel-analytics/ipex-llm). This PR
migrates the `bigdl-llm` integration to `ipex-llm` .
- **Issue**: N/A. The original PR of `bigdl-llm` is
https://github.com/langchain-ai/langchain/pull/17953
- **Dependencies**: `ipex-llm` library
- **Contribution maintainer**: @shane-huang

Updated doc:   docs/docs/integrations/llms/ipex_llm.ipynb
Updated test:
libs/community/tests/integration_tests/llms/test_ipex_llm.py

docs/vercel.json

@@ -92,6 +92,10 @@
       "source": "/docs/integrations/llms/huggingface_hub",
       "destination": "/docs/integrations/llms/huggingface_endpoint"
     },
+    {
+      "source": "/docs/integrations/llms/bigdl",
+      "destination": "/docs/integrations/llms/ipex_llm"
+    },
     {
       "source": "/docs/integrations/llms/watsonxllm",
       "destination": "/docs/integrations/llms/ibm_watsonx"