Expose getEncodingNameForModel in wasm version?

[jens-ghc]

Would it be possible to expose the function getEncodingNameForModel that's available in the javascript version also in the wasm version of the library?

The wasm version currently exposes encoding_for_model and get_encoding and both create a tokenizer instance immediately. For our uses, we'd like to first translate the model name to the underlying encoding and then instantiate the tokenizer with get_encoding ourselves. This would allow us to cache and reuse a single tokenizer across multiple models that use the same encoding.