Add support for Rye

[fpgmaas]

Is your feature request related to a problem? Please describe.

Rye is gaining a lot of popularity. As of writing, deptry does not support Rye properly, since it does not fetch development dependencies from tool.rye.dev-dependencies.

However, I can imagine that this flag is prone to change in the near future. For example astral-sh/rye#705 proposes to store dev dependencies under [project.optional-dependencies.dev], which would allow users to use the --pep621-dev-dependency-groups flag as proposed in this PR. Then there's also PEP 735 which proposes a new [dependency-groups] field, which would render special handling of Rye obsolete. And then there is also astral-sh/rye#705, which requests dependency groups. Although that does not speak directly of development dependencies, I can imagine that there is also a an ask to split development dependencies into groups (e.g. test and docs).

So this raises the question; should we simply add support for Rye's development dependencies in its current state, or do we give it some more time to see which direction the project is headed in?