Implement Keenetic model and enhance BaseDevice documentation
- Added a new `Keenetic` model that registers a parser for KeeneticOS, extending the `BaseDevice` class.
- Updated docstrings in the `BaseDevice` class methods to provide clearer descriptions of their functionality and expected data structures.
- Introduced `model_config` in the `Vlans` model to enable name-based population.
- Removed unnecessary print statements from the `Mikrotik` model methods to streamline output.
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