fix: revise of tts in rust

Walkthrough

The changes introduce enhancements to the tts-rust text-to-speech application. The .gitignore file is updated to ignore the tts-rust/target/ directory. The Cargo.toml file adds two new dependencies: tempfile and mp3-duration. In src/main.rs, the functionality for synchronizing audio output with subtitle timestamps is improved, including the creation of temporary files and additional helper functions for managing silence and audio duration.

Changes

File	Change Summary
.gitignore	Updated to ignore `tts-rust/target/` while retaining `sample_clips/`.
tts-rust/Cargo.toml	Added dependencies: `tempfile = "3.5.0"` and `mp3-duration = "0.1.10"`.
tts-rust/src/main.rs	Enhanced audio synchronization with subtitles; updated `process_subtitle` method, added `add_silence`, `create_silent_mp3_frame`, and `get_mp3_duration` methods.

Poem

🐇 In the land of code where rabbits play,
New features hop in, brightening the day!
With silence added and timestamps aligned,
Our audio sings, perfectly timed.
Dependencies sprout like carrots in rows,
In the garden of code, watch how it grows! 🌱🎶

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yike5460 / kada