Add authorship to components

[rcannood]

I think components should mention a list of authors / contributors. In OpenPipeline this is addressed by:

• Storing a list of authors in src/authors.
• Merging the individual yaml in the components, e.g.:

  authors:
    - __merge__: /src/authors/dries_de_maeyer.yaml
      roles: [ maintainer, author ]
    - __merge__: /src/authors/dries_schaumont.yaml
      roles: [ author ]

We could do the same, namely:

• Create a bunch of src/authors yamls
• Refer to the author yamls in the components
• Update the contribution documentation to reflect these changes