[FEAT]: Refactor collector to remove fluent-ffmpeg package

[shatfield4]

What would you like to see?

In the collector we use fluent-ffmpeg - this package is deprecated and we should build our own ffmpeg wrapper for this.

• Remove this dependency from the repo
• Build a custom FFMPEG class that is a sub-util specifically for LocalWhisper
• This module should look for ffmpeg cli command
• Should work in container - which has ffmpeg installer(Linux), but also work when running unbundled on Mac, Linux, and Windows.
• FFMPEG_PATH is the default path used by the existing library
• We should then use execSync or spawnSync to run the ffmpeg binary wherever it might be
• convert audio to .wav that is single channel @ 16k hz
• Output the file to a known destination in the collector tmp so that wavefile can load it in as a buffer.
• Add tests that are disabled in github actions (process.env.GITHUB_ACTIONS)
• wavefile should not perform any resampling. eg:

wavFile.toBitDepth("32f");
wavFile.toSampleRate(16000);