Allow injection of PitchDetector into PitchProcessor.

[rohankhayech]

Added constructor with PitchDetector parameter to PitchProcessor, allowing the internal pitch detector used to be specified:

public PitchProcessor(PitchDetector detector, PitchDetectionHandler handler)

This allows the specific parameters of each pitch estimation algorithm to be specified when using the pitch processor.

For example the min and max frequency for AMDF:

PitchProcessor pitchProcessor = new PitchProcessor(
    AMDF(
        sampleRate,
        audioBufferSize,
        minFrequency,
        maxFrequency
    ),
    pitchDetectionHandler
)

The existing constructor is maintained to still allow ease of use by specifying the relevant enum to use the default parameters.

[C0urante]

I ended up forking locally in order to enable this exact thing! Would be nice to see in the upstream repo if one of the maintainers has time to review.