Contribute recipe.yaml support to grayskull

[matthewfeickert]

To help adopt users adopt rattler-build and recipe.yaml for their conda projects, it would be useful to contribute support for recipe.yaml to https://github.com/conda/grayskull so that people could have grayskull generate their recipe.yaml for them from the command line. This would be a nice addition to the conda-smithy support work (conda-forge/conda-smithy#1876) mentioned in the 2024-05-08 blog post.

Though I can understand that asking for other tools to adopt official support for recipe.yaml might take some time given the CEPS listed in the README that aren't yet ratified, so this might be something that is a "nice to have" but "won't be implemented soon" situation.