Oversampler and Resampler

[kunitoki]

This pull request introduces two major new components to the yup_dsp resampling module: a reusable fixed-size circular buffer and a highly configurable multi-channel oversampler. These additions provide efficient sample history management and integer-factor oversampling with bandlimited interpolation, supporting real-time audio processing and block-based DSP algorithms.

New core DSP utilities:

• CircularBuffer utility:
  • Implements a fixed-size, template-based circular (ring) buffer with O(1) push and random-access operations, intended for efficient sample history management in DSP algorithms. (yup_CircularBuffer.h)

Oversampling functionality:

• Multi-channel integer-factor Oversampler:
  • Adds a template-based Oversampler class supporting arbitrary sample types, oversample factors, and sinc filter radii. Provides upsampling and downsampling with windowed sinc interpolation, per-channel history buffers, and block-based processing. (yup_Oversampler.h)
  • Includes methods for preparing, resetting, upsampling, downsampling, and processing oversampled blocks, with convenience type aliases for common configurations.
  • Integrates the new CircularBuffer for internal state and history management.

[codecov]

Codecov Report

❌ Patch coverage is 99.13043% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 73.60%. Comparing base (6b1184d) to head (403d257).

Files with missing lines	Patch %	Lines
modules/yup_dsp/resampling/yup_Oversampler.h	99.09%	1 Missing ⚠️
modules/yup_dsp/resampling/yup_Resampler.h	98.48%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #97      +/-   ##
==========================================
+ Coverage   73.48%   73.60%   +0.11%     
==========================================
  Files         573      577       +4     
  Lines       56596    56826     +230     
==========================================
+ Hits        41590    41826     +236     
+ Misses      15006    15000       -6     

Files with missing lines	Coverage Δ
modules/yup_dsp/resampling/yup_CircularBuffer.h	100.00% <100.00%> (ø)
modules/yup_dsp/resampling/yup_SincTable.h	100.00% <100.00%> (ø)
modules/yup_dsp/resampling/yup_Oversampler.h	99.09% <99.09%> (ø)
modules/yup_dsp/resampling/yup_Resampler.h	98.48% <98.48%> (ø)

... and 2 files with indirect coverage changes

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