Add bibtex references in the docstrings to be shown in the README

[plaguss]

Description

This PR Includes a new section in the docstrings called "Citations" that can be parsed to obtain the bibtex citation/references if informed. For example:

class DummyStep(Step):
    """This is a dummy function.

    And this is still a dummy function, but with a longer description.

    References:
        - [Argilla](https://argilla.io)

    Citations:

        ```
        @misc{xu2024magpie,
            title={Magpie: Alignment Data Synthesis from Scratch by Prompting Aligned LLMs with Nothing},
            author={Zhangchen Xu and Fengqing Jiang and Luyao Niu and Yuntian Deng and Radha Poovendran and Yejin Choi and Bill Yuchen Lin},
            year={2024},
            eprint={2406.08464},
            archivePrefix={arXiv},
            primaryClass={cs.CL}
        }
        ```

        ```
        @misc{liu2024apigenautomatedpipelinegenerating,
            title={APIGen: Automated Pipeline for Generating Verifiable and Diverse Function-Calling Datasets}, 
            author={Zuxin Liu and Thai Hoang and Jianguo Zhang and Ming Zhu and Tian Lan and Shirley Kokane and Juntao Tan and Weiran Yao and Zhiwei Liu and Yihao Feng and Rithesh Murthy and Liangwei Yang and Silvio Savarese and Juan Carlos Niebles and Huan Wang and Shelby Heinecke and Caiming Xiong},
            year={2024},
            eprint={2406.18518},
            archivePrefix={arXiv},
            primaryClass={cs.CL},
            url={https://arxiv.org/abs/2406.18518}, 
        }
        ```
    """
    ...

If "Citations" section is informed, it will be inserted in the Distiset automatically. If they are not informed but the references include a URL pointing to arxiv, we will try to obtain it by making a request to https://arxiv.org.

References in the docs:

And as part of the tags:

Dummy repo to see an example

[github-actions]

Documentation for this PR has been built. You can view it at: https://distilabel.argilla.io/pr-855/

[codspeed-hq]

CodSpeed Performance Report

Merging #855 will not alter performance

_{Comparing citation-in-readme (27711c3) with develop (4e1f2bc)}

Summary

✅ 1 untouched benchmarks

[gabrielmbmb]

LGTM!