Add support for GPTNeo for KV cache injection

[mgoin]

Thanks to @dbogunowicz for building up the injection config. Tested with TinyStories models on HF and then in deepsparse pipeline

https://huggingface.co/mgoin/TinyStories-1M-deepsparse
https://huggingface.co/mgoin/TinyStories-33M-deepsparse

optimum-cli export onnx --task text-generation -m roneneldan/TinyStories-1M TinyStories-1M 
python ~/onnx_kv_inject.py --input-file TinyStories-1M/decoder_model.onnx --output-file TinyStories-1M/model.onnx

numactl -N0 -m0 python deepsparse/examples/chat-compare/app.py TinyStories-1M --sequence_length 2048 --max_new_tokens 2000
Welcome to the interactive text generation interface!
Type 'exit' to end the session.
> Once upon a time

<DeepSparse output>

Once upon a time, there was a little girl named Lily. She loved to play outside in the sunshine. One day, she saw a big, shiny rock in the sky. She wanted to touch it, but it was too high.

Lily's mommy told her that it was important to be careful and not touch things. Lily didn't want to touch it, so she asked her mommy if she could touch it. Her mommy said yes and they went to the park.

Lily was so happy and excited to see the rock. She picked it up and started to play with it. She was so happy that she forgot about the rock. She was happy that she had made a new friend.
<|endoftext|>

<ORT output>

Once upon a time, there was a little girl named Lily. She loved to play outside in the sunshine. One day, she saw a big, shiny rock in the sky. She wanted to touch it, but it was too high.

Lily's mommy told her that it was important to be careful and not touch things. Lily didn't want to touch it, so she asked her mommy if she could touch it. Her mommy said yes and they went to the park.

Lily was so happy and excited to see the rock. She picked it up and started to play with it. She was so happy that she forgot about the rock. She was happy that she had made a new friend.
<|endoftext|>