feat(python)!: Rename ModuleUpgradeRequired and PolarsPanicError error, remove InvalidAssert error

[stinodego]

Changes

• Rename PolarsPanicError to PanicException. We are just re-exporting PyO3's PanicException, so the user sees pyo3_runtime.PanicException: .... Re-exporting under a different name just causes confusion.
• Rename ModuleUpgradeRequired to ModuleUpgradeRequiredError. This is to satisfy naming conventions (errors should end in Error).
• Remove InvalidAssert error. It was used in 1 place (testing utils) and not really necessary. A TypeError should suffice here.
• Change an error for unsortable types from ComputeError to InvalidOperationError.
• Update definition of PolarsError and PolarsWarning so that the display matches the name (previously would show PolarsBaseError/PolarsBaseWarning).

I also considered removing the PanicException re-export altogether and making users write a bare except:, since panics are not really intended to be handled... open to feedback on this one.

[codecov]

Codecov Report

Attention: Patch coverage is 83.14607% with 15 lines in your changes missing coverage. Please review.

Project coverage is 80.97%. Comparing base (8a410ca) to head (1dcdfee).

Files	Patch %	Lines
py-polars/polars/dataframe/frame.py	0.00%	7 Missing ⚠️
py-polars/polars/series/series.py	25.00%	3 Missing ⚠️
py-polars/polars/io/spreadsheet/functions.py	0.00%	2 Missing ⚠️
py-polars/polars/dependencies.py	50.00%	1 Missing ⚠️
py-polars/polars/io/database/_executor.py	50.00%	1 Missing ⚠️
py-polars/src/map/mod.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #17033      +/-   ##
==========================================
+ Coverage   80.95%   80.97%   +0.01%     
==========================================
  Files        1448     1448              
  Lines      190554   190586      +32     
  Branches     2723     2723              
==========================================
+ Hits       154265   154323      +58     
+ Misses      35786    35759      -27     
- Partials      503      504       +1     

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