penguinolog / urwid / 29985062475 / 11

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Typing: introduce `AbstractWidget` abstract base class/protocol

* Support Widget implementation not subclassing `Widget`
* Proper protocol based validation and abstract base usage
* * `focus_position` is not listed since it's raising `IndexError` on attribute access check
* For internal usage to explicit declare required protocols provide `AbstractBoxWidget` and `AbstractFlowWidget` protocols
* * Limitation: before python 3.12 `Filler` can not be properly typed for `AbstractBoxWidget | AbstractFlowWidget` usage depends on `height` argument.

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