* add cli commands for adding/ removing resources
as discussed with Adrian, we want to adopt "lightning add" and "lightning remove" for ssh-keys,
as the resource already exists.
* implement ssh-key management
* one parameter for public key, optional name
* handle the case where a private key file was provided
* make ssh key-mgmt support classes protected
* re-order add ssh-key args
* change types signatures of add_key
* rename test cases
* update changelog
Co-authored-by: Adrian Wälchli <aedu.waelchli@gmail.com>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Raphael Randschau