upgrade dashscope to new architecture (#10966)

docs/examples/embeddings/dashscope_embeddings.ipynb

docs/examples/llm/dashscope.ipynb

docs/examples/multi_modal/dashscope_multi_modal.ipynb

...ns/embeddings/llama-index-embeddings-dashscope/.gitignore

...rations/embeddings/llama-index-embeddings-dashscope/BUILD

...ions/embeddings/llama-index-embeddings-dashscope/Makefile

...ons/embeddings/llama-index-embeddings-dashscope/README.md

...beddings-dashscope/llama_index/embeddings/dashscope/BUILD

...gs-dashscope/llama_index/embeddings/dashscope/__init__.py

...ddings-dashscope/llama_index/embeddings/dashscope/base.py

...mbeddings/llama-index-embeddings-dashscope/pyproject.toml

...s/embeddings/llama-index-embeddings-dashscope/tests/BUILD

...ddings/llama-index-embeddings-dashscope/tests/__init__.py

...x-embeddings-dashscope/tests/test_embeddings_dashscope.py