Add ffprobe/ffmpeg integration and models for Audible chapters and voucher

- Add new dependencies: Inflector, crossterm, and related crates.
- Implement ffprobe and ffmpeg command integration in src/main.rs.
- Add models for chapters, ffprobe format, and voucher deserialization in src/models/chapters.rs, src/models/ffprobe_format.rs, and src/models/voucher.rs.
- Create a module aggregator in src/models/mod.rs.
- Update Cargo.toml and Cargo.lock for new dependencies.

Cargo.toml

@@ -7,3 +7,6 @@ edition = "2021"
 serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0"
 clap = { version = "4.5", features = ["derive"] }
+crossterm = "0.28"
+
+Inflector = { version = "0.11", default-features = false }