feat: Implement advanced audio editing, WSOLA time stretching & project I/O

[LSXPrime]

This commit introduces a new, powerful audio editing and mixing module, alongside significant enhancements to the core audio engine.

Features:

• New Composition, Track, and AudioSegment classes for timeline-based audio arrangement.
• Support for essential segment operations: insert, remove, replace, silence, trim, duplicate, and offset.
• Per-segment playback controls: volume, pan, fade-in/out (linear, logarithmic, S-curve), reverse playback, looping (by repetitions or target duration), and playback speed.
• Implement pitch-preserved time stretching using the WSOLA algorithm at the audio segment level.
• Allow dynamic application of SoundModifiers and AudioAnalyzers at the segment, track, and composition master output levels.
• Introduce CompositionProjectManager for saving and loading projects, including options for media consolidation into the project folder and embedding small audio assets directly.

Core Enhancements:

• Integrate WsolaTimeStretcher into SoundPlayerBase for robust pitch-preserved time stretching, enabling granular control over segment duration without affecting pitch.
• Refactor SoundPlayerBase for improved handling of playback speed changes, complex looping, and seeking logic.
• Update ISoundDataProvider to standardize SampleRate as a non-nullable property and include IsDisposed for better resource management.
• Enhance RawDataProvider to directly support float[], byte[], int[], and short[] array sources, simplifying raw audio handling.
• Improve Mixer's component management by switching to ConcurrentDictionary for thread-safe operations and implement IDisposable for proper cleanup of child components.
• Add an Enabled property to SoundModifier and AudioAnalyzer abstract classes, allowing runtime activation/deactivation of effects and analyses.

Build & Infrastructure:

• Introduce SoundFlow.Samples.EditingMixer project, providing extensive examples that showcase the new editing module's functionality.
• Update stale workflow configuration in .github/workflows/stale.yml to exempt 'in-progress' and 'backlog-feature' issues from automatic closing.
• Adjust native library loading paths in MiniAudio backend for improved robustness in various deployment scenarios.

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