feat: audio synthesizer

[JacobLinCool]

This pull request includes changes to the Cargo.toml file, adding a new binary target and optional dependencies related to audio processing.

Key changes:

• New Binary Target:

  • Added a new binary target named synthesize with the required feature audio.

• Optional Dependencies:

  • Added symphonia and hound as optional dependencies for audio processing.

• Feature Group:

  • Added a new feature group audio that includes symphonia and hound.

[changeset-bot]

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Latest commit: 0a28cd5

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