feat: add tokenize endpoint #1650
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Description
I get these fields from vLLM: https://github.com/vllm-project/vllm/blob/d2c919dcc20b1ea77a94fa01e813ebbb31f8a66a/vllm/entrypoints/openai/protocol.py#L1897
TODO: remove the fields related to transformers, these should not be generic.
Something needs to be discussed:
1 I want to name it as
OpenAIalthough tokenize endpoint is not supported in OpenAI models. The reason is that these fields are from OpenAI.TODO:
For OpenAI models, we can just use golang binding for https://github.com/openai/tiktoken.