Time domain stretching

[kunitoki]

This pull request adds support and comprehensive tests for the new timeDomain backend in the TimeStretchProcessor, making it available as a selectable and testable backend for time-stretching operations. The changes also improve test coverage and simplify build configuration for backend-specific tests.

TimeStretchProcessor Backend Support:

• Added the timeDomain backend option to the TimeStretchProcessor::Backend enum, allowing explicit selection of the built-in time-domain backend.
• Updated backend availability and discovery logic to include the timeDomain backend in isBackendAvailable and getAvailableBackends.

Testing Enhancements:

• Added multiple tests for preparing, setting, and processing with the timeDomain backend, ensuring it can be selected, initialized, and used for processing audio. [1] [2] [3]
• Improved conditional compilation for Bungee backend tests, wrapping them with #if YUP_ENABLE_BUNGEE to avoid unnecessary test exclusion and to clarify backend-specific coverage. [1] [2] [3]

Build Configuration:

• Removed unnecessary preprocessor conditionals around the inclusion of yup_TimeStretchProcessor.cpp in the test suite, ensuring the file is always included.

[codecov]

Codecov Report

❌ Patch coverage is 88.94118% with 47 lines in your changes missing coverage. Please review.
✅ Project coverage is 74.86%. Comparing base (c64d1c2) to head (f908896).

Files with missing lines	Patch %	Lines
..._dsp/stretching/yup_TimeStretchTimeDomainBackend.h	90.73%	29 Missing ⚠️
.../yup_dsp/stretching/yup_TimeStretchBungeeBackend.h	82.85%	18 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #104      +/-   ##
==========================================
+ Coverage   74.76%   74.86%   +0.09%     
==========================================
  Files         587      590       +3     
  Lines       58891    59209     +318     
==========================================
+ Hits        44031    44326     +295     
- Misses      14860    14883      +23     

Files with missing lines	Coverage Δ
...es/yup_dsp/stretching/yup_TimeStretchProcessor.cpp	94.16% <100.00%> (+5.50%)	⬆️
...ules/yup_dsp/stretching/yup_TimeStretchProcessor.h	83.33% <ø> (ø)
...up_dsp/stretching/yup_TimeStretchProcessorEngine.h	100.00% <100.00%> (ø)
modules/yup_dsp/windowing/yup_WindowFunctions.h	84.90% <ø> (ø)
.../yup_dsp/stretching/yup_TimeStretchBungeeBackend.h	82.85% <82.85%> (ø)
..._dsp/stretching/yup_TimeStretchTimeDomainBackend.h	90.73% <90.73%> (ø)

... and 2 files with indirect coverage changes

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