Add o200k_harmony encoding used by gpt-oss models #131
Description
OpenAI's gpt-oss-120b and gpt-oss-20b models use o200k_harmony encoding.
We should add this encoding and map the models to it.
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OpenAI's gpt-oss-120b and gpt-oss-20b models use o200k_harmony encoding.
We should add this encoding and map the models to it.