Add missing special token properties to MistralCommonTokenizer
Author: hqkqn32
Pull request: yes

- Add all_special_ids property for vLLM compatibility
- Add all_special_tokens property
- Add all_special_tokens_extended property
- Fixes AttributeError when using with vLLM

# What does this PR do?

Fixes AttributeError when using `MistralCommonTokenizer` with vLLM by adding missing special token properties.

vLLM expects tokenizers to have `all_special_tokens`, `all_special_ids`, and `all_special_tokens_extended` properties, but `MistralCommonTokenizer` was missing these, causing:

AttributeError: 'MistralCommonTokenizer' object has no attribute 'all_special_tokens'

Fixes #39841


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Comments:
cc @itazap (see https://github.com/huggingface/transformers/issues/39841 as well)

Bump