chore: add credo configuration

[ruilopesm]

No description provided.

[reviewpad]

AI-Generated Summary: This pull request introduces a Credo configuration file for the Elixir project which set-ups various styles, design, readability and refactoring checks. It also modifies the lint command in mix.exs file to make use of this newly introduced configuration file. This commit contain modifications in different seed files to better align with the established code style and improve overall code readability. These changes include reordering of the alias declarations, refining the function names by removing unnecessary parenthesis, and adhering to the single responsibility principle by separating multiple aliases to individual lines.

[danielsp45]

LGTM