Add FSNER example in research_projects
# What does this PR do?

- This PR adds example code for FSNER (few-shot named entity recognition) using huggingface's `transformers` library.
- Only prediction/inference code is provided, training code will be provided very soon.


## Before submitting
- [ ] This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
- [x] Did you read the [contributor guideline](https://github.com/huggingface/transformers/blob/master/CONTRIBUTING.md#start-contributing-pull-requests),
      Pull Request section?
- [x] Was this discussed/approved via a Github issue or the [forum](https://discuss.huggingface.co/)? Please add a link
      to it if that's the case.
https://github.com/huggingface/transformers/pull/13133
- [ ] Did you make sure to update the documentation with your changes? Here are the
      [documentation guidelines](https://github.com/huggingface/transformers/tree/master/docs), and
      [here are tips on formatting docstrings](https://github.com/huggingface/transformers/tree/master/docs#writing-source-documentation).
- [ ] Did you write any new necessary tests?


## Who can review?

@NielsRogge @LysandreJik
Anyone in the community is free to review the PR once the tests have passed. Feel free to tag
members/contributors who may be interested in your PR.

<!-- Your PR will be replied to more quickly if you can figure out the right person to tag with @

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Models:

- albert, bert, xlm: @LysandreJik
- blenderbot, bart, marian, pegasus, encoderdecoder,  t5: @patrickvonplaten, @patil-suraj
- longformer, reformer, transfoxl, xlnet: @patrickvonplaten
- fsmt: @stas00
- funnel: @sgugger
- gpt2: @patrickvonplaten, @LysandreJik
- rag: @patrickvonplaten, @lhoestq
- tensorflow: @LysandreJik

Library:

- benchmarks: @patrickvonplaten
- deepspeed: @stas00
- ray/raytune: @richardliaw, @amogkam
- text generation: @patrickvonplaten
- tokenizers: @n1t0, @LysandreJik
- trainer: @sgugger
- pipelines: @LysandreJik

Documentation: @sgugger

HF projects:

- datasets: [different repo](https://github.com/huggingface/datasets)
- rust tokenizers: [different repo](https://github.com/huggingface/tokenizers)

Examples:

- maintained examples (not research project or legacy): @sgugger, @patil-suraj
- research_projects/bert-loses-patience: @JetRunner
- research_projects/distillation: @VictorSanh

 -->

Looks great already! I left some small comments.<|||||>Hi @NielsRogge !

Would you mind telling me what else should I do? Or it's ready to merge?

Thanks!<|||||>Hi,

Now others need to review this, once they're back from holiday ;)<|||||>This issue has been automatically marked as stale because it has not had recent activity. If you think this still needs to be addressed please comment on this thread.

Please note that issues that do not follow the [contributing guidelines](https://github.com/huggingface/transformers/blob/master/CONTRIBUTING.md) are likely to be ignored.<|||||>Hi @sayef, there are a few code quality issues; I tried to push to your branch but I do not have push access on your branch.

Could you run the following commands at the root of your clone? It should tell you what needs fixing:
```
pip install -U -e .[quality]
make fixup
```<|||||>Hi @LysandreJik,

I followed what you suggested. Let me know if I need to do anything else. :)
<|||||>Hi @sayef  - I believe you also rebased or merged the `master` branch into your PR. Unfortunately, GitHub sometimes has issues understanding what happened, for example here your PR shows 245 commits and 466 files changed. 

Usually just closing the PR and opening a new one from the same branch, without changing anything is enough. Would you mind doing that and pinging me so that I may merge? Thank you!<|||||>> Usually just closing the PR and opening a new one from the same branch, without changing anything is enough. Would you mind doing that and pinging me so that I may merge? Thank you!

Okay. Closing here and will ping you in other PR.
