feat: add support for cutting silences from audio recordings

[appleboy]

• Add a new field CutSilences to the Whisper struct
• Update the Dockerfile to install additional dependencies
• Add a new flag cut-silences to the CLI
• Implement the cutSilences function in the audio.go file
• Update the Transcript function in the whisper.go file to handle cutting silences from audio

[codecov[bot]]

Codecov Report

Attention: 25 lines in your changes are missing coverage. Please review.

Comparison is base (7747af1) 7.50% compared to head (bf6f80e) 9.65%. Report is 8 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #26 +/- ## ======================================== + Coverage 7.50% 9.65% +2.14% ======================================== Files 6 6 Lines 253 290 +37 ======================================== + Hits 19 28 +9 - Misses 232 260 +28 Partials 2 2 ``` | [Files](https://app.codecov.io/gh/appleboy/go-whisper/pull/26?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Bo-Yi+Wu) | Coverage Δ | | |---|---|---| | [whisper/audio.go](https://app.codecov.io/gh/appleboy/go-whisper/pull/26?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Bo-Yi+Wu#diff-d2hpc3Blci9hdWRpby5nbw==) | `0.00% <0.00%> (ø)` | | | [whisper/whisper.go](https://app.codecov.io/gh/appleboy/go-whisper/pull/26?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Bo-Yi+Wu#diff-d2hpc3Blci93aGlzcGVyLmdv) | `7.87% <0.00%> (-0.74%)` | :arrow_down: | ... and [3 files with indirect coverage changes](https://app.codecov.io/gh/appleboy/go-whisper/pull/26/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Bo-Yi+Wu)

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