Release 2.3.0

[AlexisChoupault]

No description provided.

[gemini-code-assist]

Code Review

This pull request updates the documentation, changelog, and project configuration to support the new calendar and event editing features, alongside the refactoring of ETException. The review feedback recommends correcting the changelog description of ETException to specify a sealed class hierarchy rather than a composite pattern, and correcting grammatical phrasing in the API reference by using 'an' instead of 'a' before exception names starting with 'ET'.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.85%. Comparing base (8bc514f) to head (60a44b8).

Additional details and impacted files

@@            Coverage Diff            @@
##               main     #121   +/-   ##
=========================================
  Coverage     87.85%   87.85%           
  Complexity      115      115           
=========================================
  Files            23       23           
  Lines          4209     4209           
  Branches        112      112           
=========================================
  Hits           3698     3698           
  Misses          432      432           
  Partials         79       79           

Flag	Coverage Δ
unittests	87.85% <ø> (ø)

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