feat(ffmpeg): enhance codec support and hardware encoder handling across platforms

[skrashevich]

This Pull Request introduces significant updates to the handling and verification of encoders within our ffmpeg configuration for various operating systems. The changes aim to improve reliability and performance when deploying on diverse hardware setups. Below is a detailed outline of the modifications included:

1. Core Configuration Updates (ffmpeg.go):

   • Integrated functionality to retrieve a comprehensive list of available encoders directly from ffmpeg using the command line. This addition ensures that our software dynamically adapicates based on the available encoders on the system.

2. Platform-Specific Hardware Encoder Checks:

   • Darwin (hardware_darwin.go) and Unix (hardware_unix.go):
     • Added checks to verify if specific codecs are supported before attempting to use them. This preventative measure avoids runtime errors and optimizes encoder selection based on actual hardware capabilities.

3. New Helper Modules (encoders.go and encoders_test.go):

   • Developed new modules to parse and test the encoder listings provided by ffmpeg. These tools facilitate accurate validation of encoder support, enhancing the robustness of our application.

Overall, this update ensures a more stable and optimized usage of hardware encoders, tailored to the capabilities of the host machine, thereby improving media processing efficiency and reliability.