feat(audio): Add helper method to downsize audio records

[ERosendo]

This PR introduces a new helper method named convert_to_ogg which uses ffmpeg to convert media files to the OGG format with the following specifications:

• Single audio channel and 8 kHz sampling rate (-b:a 8k)
• Optimized for voice over IP applications (-application voip)
• Crisp audio at smaller file sizes.

Additionally, this PR updates the audio endpoint to support Ogg conversion and removes the file extension from the temporary filepath. This enhancement enables more flexible output formatting.

[sentry-io]

🔍 Existing Issues For Review

Your pull request is modifying functions with the following pre-existing issues:

📄 File: doctor/views.py

Function	Unhandled Issue
convert_audio	OSError: file not found: /tmp/audio_29dfe5eb51ce4ac9836427ae84a9946b.mp3 ... Event Count: 1

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[mlissner]

Seems fine to me, but we should add a few lines to the readme too, please.

[ERosendo]

Sure!