llama : remove token functions with `context` args in favor of `model` (#3720)

llama : remove token functions with `context` args in favor of `model` (#3720)

* added `llama_model_token_*` variants to all the `llama_token_*` functions.

* added `LLAMA_API`

* formatting

Co-authored-by: Georgi Gerganov <redacted>
* removed old `llama_token` functions

* changed 3 more functions to take in model

- `llama_token_get_text`
- `llama_token_get_score`
- `llama_token_get_type`

* added back docs

* fixed main.cpp

* changed token functions to use new model variants

* changed token functions to use new model variants

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Co-authored-by: Georgi Gerganov <redacted>