chore: Make ratatui optional on tui-popups (Breaking / Help Wanted

[joshka]

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Rely on ratatui-core types mainly except for the interaction with crossterm.

The goal here was to remove the reliance on the unstable WidgetRef and StatefulWidgetRef traits, which are in Ratatui, and replace it with the stable Widget/StatefulWidget traits in Ratatui-core.

I haven't found a way (yet) to make this work for &W: Widget instead of W: Widget + Clone. Leaving this open a bit for anyone that wants to give feedback on the change / explore whether this is possible to fix.

This is the call that needs to work (render the body widget of the popup. https://github.com/joshka/tui-widgets/blob/83e45dbb31566ade6b323d05820c711561a1a46c/tui-popup/src/popup.rs#L147

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 92.30769% with 1 line in your changes missing coverage. Please review.

Project coverage is 73.53%. Comparing base (83e45db) to head (b73e779).

Files with missing lines	Patch %	Lines
tui-popup/src/known_size_wrapper.rs	83.33%	1 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #52      +/-   ##
==========================================
+ Coverage   73.34%   73.53%   +0.18%     
==========================================
  Files          14       14              
  Lines        2465     2441      -24     
==========================================
- Hits         1808     1795      -13     
+ Misses        657      646      -11     

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