Removing RobertaConfig inheritance from CamembertConfig
Author: Saad135
Pull request: yes

# What does this PR do?

Removes RobertaConfig dependencies from CamembertConfig

Related to https://github.com/huggingface/transformers/issues/19303

@sgugger can I please get some feedback on this. Thanks 😄 
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Comments:
_The documentation is not available anymore as the PR was closed or merged._

> Also make sure you run `make style` on your branch to fix the formatting.

`make style` changed some files in other folders as well related to other models. Since I didn't change them, I didn't add them in this PR, and only added the camembert_configuration.py file with the fixed style.

I was unsure if I should add style changes in other files in this PR, since this PR is about CamembertConfig.