Compatibility with seaborn 0.13

[getzze]

fixes #81 #122 #131 #133 #143

Compatibility with seaborn>=0.11 All tests are passing

In seaborn 0.12, internals were rewritten for categorical plots and in version 0.13 again. There were also some changes to the interface:

• new parameters native_scale and formatter (I added support for them only for seaborn 0.13)
• hue can be used redundantly with a x or y variable to signal that the colors should change depending on this variable. Therefore I added code (and tests) to check for a redundant hue parameter.

I also removed the dependency blocker for pandas<2.0.0 because it does not affect statannotations but seaborn, therefore it should be dealt with in seaborn. Test are passing with pandas==2.2.2.

Organization of this PR:

• all the code dependent on seaborn version was put in a compat.py file.
• _GroupsPositions.py and _Plotter.py were reworked to be agnostic to seaborn internals.

[getzze]

Tests don't pass only for python 3.6 which is EOL since 2021-12-23. Python 3.7 is also EOL, and python 3.8 is soon-to-be btw.

Tests for python 3.12 are passing in local (only compatible with seaborn 0.13)

@trevismd you can review when you have time! Thanks