[RoFormer] Fix some issues
Author: JunnYu
Pull request: yes

# What does this PR do?

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<!-- Remove if not applicable -->
- add RoFormerTokenizerFast into AutoTokenizer
- fix typo in roformer docs
- Fix #12000 and make onnx export happy
- update RoFormerConfig embedding_size
- use jieba not rjieba and then we can enjoy "Hosted inference API in huggingface.co"
- fix #12244 and make test_alignement passed
- update roformer ARCHIVE_MAP


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@patil-suraj
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Models:

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Comments:
Ok thanks, I just will let Lysandre review the `try:except` block, that's the only thing remaining.

> This looks good, but why did you change `rjieba` to `jieba`? Is the latter better?

@LysandreJik
I want to use `Hosted inference API` in https://huggingface.co. 
![image](https://user-images.githubusercontent.com/50394665/124454105-ac577380-ddba-11eb-9d0c-bbbfe0a1a700.png)

I found  `CpmTokenizer` and `XLMTokenizer` use jieba.
https://github.com/huggingface/transformers/blob/fb41f9f50c37aba0eced055323ba17e4203f7d57/src/transformers/models/cpm/tokenization_cpm.py#L31
https://github.com/huggingface/transformers/blob/b24ead87e1be6bce17e4ec5c953b6d028e4b3af7/src/transformers/models/xlm/tokenization_xlm.py#L530

cc @Narsil 

@JunnYu Should work now: 

https://huggingface.co/junnyu/roformer_chinese_base?text=%E7%94%9F%E6%B4%BB%E7%9A%84%E7%9C%9F%E8%B0%9B%E6%98%AF+%5BMASK%5D%E3%80%82

We do update the API regularly with dependencies, `rjieba`was added pretty recently. 
Cheers ! 

@Narsil thank you!

@LysandreJik 
(1) Now I use `rust jieba` .  
(2) This pr https://github.com/huggingface/transformers/pull/12361 add `test_training_new_tokenizer` and `test_training_new_tokenizer_with_special_tokens_change`. 
I found  `test_tokenization_roformer.py` can't pass these two tests. Because `roformer tokenizer` has a custom PreTokenizer. 
https://github.com/huggingface/transformers/blob/e2c1dd09667af5a535689c371b4658c36681131f/src/transformers/convert_slow_tokenizer.py#L318