Fix llama-hub Data Loader "GPTRepo" encoding issue, supporting gemini embedding more configurations. (#10802)

* Support Gemini "transport" configuration

Added Gemini transportation method configuration support.

* Sync updates in multi_modal_llms\gemini

* Updated Dashscope qwen llm defaults

Setting qwen default num_outputs and temperature

* cr

* support gemini embedding configuration

support configuring api_base, api_key, transport method

* fix gptrepo data connector encoding issue

reading a file in default encoding(GBK) will cause error characters problem. Added encoding configuration

* sync latest repo

* sync latest repo

* cr

* cr

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Co-authored-by: Haotian Zhang <socool.king@gmail.com>