feat: allow users self setting token counter from ModelFactory

[lllllyh01]

Description

Allow users self setting token counter from ModelFactory. If not set, OpenAITokenCounter(ModelType.GPT_3_5_TURBO) will be used as default (except for Lite LLM, as LiteLLMTokenCounter is not a subclass with BaseTokenCounter)

Motivation and Context

close #589

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[Wendong-Fan]

Thanks @lllllyh01 ! I added some update in below commit, please feel free to check it

975d630

[lllllyh01]

Thanks @lllllyh01 ! I added some update in below commit, please feel free to check it

975d630

Hi Wendong, it looks good to me! Thank you for your improvement.