feature: Implement provider interface in client role

[jakub-vavra-cz]

Allow Client to be used as provider by implementing user, group, sudorule interfaces.
Implement LocalSudoRule class.
Extend BareClient with BareClientTopologyController that setups local domain using either files-provider or proxy files.

[gemini-code-assist]

Code Review

This pull request introduces a provider interface for the Client role to manage local users, groups, and sudo rules, along with a BareClientTopologyController for setting up bare client test environments. This is a valuable enhancement for testing. My review primarily focuses on the new LocalSudoRule class, where I've identified several critical issues that could lead to incorrect behavior or runtime errors. I've also included some medium-severity suggestions to improve robustness and documentation.

[gemini-code-assist]

Code Review

This pull request introduces a provider interface to the Client role, allowing it to manage local users, groups, and sudo rules, which is a great enhancement for testing. It also adds a BareClientTopologyController for setting up clients without a full provider. The implementation of LocalSudoRule is comprehensive but has a few issues related to rule string generation and filename uniqueness that could lead to bugs in tests. I've provided suggestions to address these correctness issues and improve documentation consistency.

[danlavu]

This is great, just nitpicks. I haven't tested it yet, but I will approve after I test it. Thank you.

[aplopez]

LGTM