Initial Composer Implementation

[wbaldoumas]

Description

• Move domain-specific code into BaroquenMelody.Library.Compositions.* namespace
• Move general-purpose code into BaroquenMelody.Library.Infrastructure.* namespace
• Implement GetInitialChord on the ICompositionStrategy which chooses an initial chord (for now just the root chord) and intelligently avoids doubling voices more than once
• Create an IComposer interface and basic Composer implementation that uses an ICompositionStrategy to piece together a composition

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: 3 lines in your changes are missing coverage. Please review.

Comparison is base (a88bde9) 97.46% compared to head (d241e76) 98.98%.
Report is 1 commits behind head on main.

Files	Patch %	Lines
...Library/Compositions/Extensions/MeterExtensions.cs	60.00%	1 Missing and 1 partial ⚠️
...ary/Compositions/Strategies/CompositionStrategy.cs	97.72%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #44      +/-   ##
==========================================
+ Coverage   97.46%   98.98%   +1.52%     
==========================================
  Files          29       33       +4     
  Lines         474      594     +120     
  Branches       31       41      +10     
==========================================
+ Hits          462      588     +126     
+ Misses         11        3       -8     
- Partials        1        3       +2     

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