Composition abstractions

[wbaldoumas]

Description

Composition abstractions:

• Beat
• Measure
• Composition
• Meter

Also adjusted some namespaces.

Type of Change

• Bug Fix
• New Feature
• Breaking Change
• Refactor
• Documentation
• Other (please describe)

Checklist

• I have read the contributing guidelines
• Existing issues have been referenced (where applicable)
• I have verified this change is not present in other open pull requests
• Functionality is documented
• All code style checks pass
• New code contribution is covered by automated tests
• All new and existing tests pass

[codecov]

Codecov Report

Attention: 10 lines in your changes are missing coverage. Please review.

Comparison is base (1f973f7) 99.58% compared to head (cf7dca7) 97.54%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #34      +/-   ##
==========================================
- Coverage   99.58%   97.54%   -2.04%     
==========================================
  Files          26       29       +3     
  Lines         479      489      +10     
  Branches       31       31              
==========================================
  Hits          477      477              
- Misses          1       11      +10     
  Partials        1        1              

Files	Coverage Δ
...Melody.Library/Compositions/Choices/ChordChoice.cs	100.00% <ø> (ø)
...mpositions/Choices/ChordChoiceRepositoryFactory.cs	100.00% <ø> (ø)
.../Compositions/Choices/DuetChordChoiceRepository.cs	100.00% <ø> (ø)
...sitions/Choices/Extensions/NoteChoiceExtensions.cs	100.00% <ø> (ø)
...nMelody.Library/Compositions/Choices/NoteChoice.cs	100.00% <ø> (ø)
...ibrary/Compositions/Choices/NoteChoiceGenerator.cs	100.00% <ø> (ø)
...mpositions/Choices/QuartetChordChoiceRepository.cs	100.00% <ø> (ø)
.../Compositions/Choices/TrioChordChoiceRepository.cs	100.00% <ø> (ø)
src/BaroquenMelody.Library/Compositions/Chord.cs	100.00% <ø> (ø)
...sitions/Configurations/CompositionConfiguration.cs	100.00% <100.00%> (ø)
... and 15 more

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