[WIP] add Fusion In Decoder model
Author: oh-gnues-iohc
Pull request: yes

# What does this PR do?

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add FiD(Fusion In Decoder) models

I have completed fine-tuning using Hugging Face's Trainer on a server with 4 A40 GPUs and have also verified that generation works properly. I have implemented FiD (Fusion-in-Decoder) quite simply with almost no changes from the T5 model.

but in ''python utils/check_config_attributes.py''
feed_forward_proj This option is used, but an error occurs.

Since this is my first contribution to open source, I may not know exactly what to do and could make things difficult for you, but if you have any good ideas, please let me know.

@ArthurZucker  @younesbelkada 

## Before submitting
- [x] This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
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      Pull Request section?
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- [x] Did you write any new necessary tests?


## Who can review?

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Models:

- text models: @ArthurZucker and @younesbelkada
- vision models: @amyeroberts
- speech models: @sanchit-gandhi
- graph models: @clefourrier

Library:

- flax: @sanchit-gandhi
- generate: @gante
- pipelines: @Narsil
- tensorflow: @gante and @Rocketknight1
- tokenizers: @ArthurZucker
- trainer: @muellerzr and @pacman100

Integrations:

- deepspeed: HF Trainer/Accelerate: @pacman100
- ray/raytune: @richardliaw, @amogkam
- Big Model Inference: @SunMarc
- quantization (bitsandbytes, autogpt): @SunMarc and @younesbelkada

Documentation: @stevhliu and @MKhalusova

HF projects:

- accelerate: [different repo](https://github.com/huggingface/accelerate)
- datasets: [different repo](https://github.com/huggingface/datasets)
- diffusers: [different repo](https://github.com/huggingface/diffusers)
- rust tokenizers: [different repo](https://github.com/huggingface/tokenizers)

Maintained examples (not research project or legacy):

- Flax: @sanchit-gandhi
- PyTorch: See Models above and tag the person corresponding to the modality of the example.
- TensorFlow: @Rocketknight1

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