Make requirement of `Suggests` package optional

[yogat3ch]

It is rarely the case that packages in the Suggests field are needed when deploying a golem app. R does not install Suggests packages when packages are downloaded, and thus the the build process for Dockerfiles should not require that packages listed in Suggests be installed for deployment.

This adds an argument require_suggests to the following functions:

• create_renv_for_dev
• att_amend_desc
• att_to_desc_from_is in order to be passed down from golem::add_dockerfile_with_renv_, which will be in a related PR on golem.

[VincentGuyader]

thanks for this PR, I will work on it to add unit test It is really a feature that will be useful to alleviate the deployment of golem app!

[yogat3ch]

Thanks for considering it @VincentGuyader!