Add RocBert
Author: sww9370
Pull request: yes

This PR adds the [RocBert model](https://aclanthology.org/2022.acl-long.65.pdf).

RocBert is a pre-trained Chinese language model that is designed from the ground up to be robust against maliciously crafted adversarial texts such as misspellings, homograph attacks, and other forms of deception. 
 ![image](https://user-images.githubusercontent.com/8551423/199227161-1df88191-542e-447f-9bfd-5e3fa708d4d8.png)
This property is crucial in downstream applications like content moderation.



RocBert differs from the classic Bert architecture in the following ways:

- besides token ids, the model also takes phonetic features and glyph features as input
- the model is also pre-trained with a contrastive learning objective that stabilizes the feature space against synthetic attacks

Since the model structure and tokenizer is quite different from existing implementations, we would like to submit this PR to add a new model class.




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Models:

- albert, bert, xlm: @LysandreJik
- blenderbot, bart, marian, pegasus, encoderdecoder,  t5: @patrickvonplaten, @patil-suraj
- longformer, reformer, transfoxl, xlnet: @patrickvonplaten
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- tokenizers: @n1t0, @LysandreJik
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- datasets: [different repo](https://github.com/huggingface/datasets)
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Comments:
_The documentation is not available anymore as the PR was closed or merged._

@sgugger Thanks for your suggestion, I already fixed it ~

@ArthurZucker hi, I already fixed the code according to sgugger's advice., could you please review it, thanks!

Yes! Doing this asap 🤗 sorry for the delay 

Last comment, it seems that the issue with naming still persists, we should make sure to either write `RoC` or `Roc` everywhere. 

@ArthurZucker  I didn't make [weiweishi/roc-bert-base-zh](https://huggingface.co/weiweishi/roc-bert-base-zh) public before, it's avaliable now,  and other issues are resolved~