Implement AC4 support

[CastagnaIT]

Description

Implement AC4 audio

TODO: check for possible required changes to AudioCodecHandler

Motivation and context

some months ago i seen some changes on kodi core about ac4 i made an attempt to check if it actually works unfortunately at today kodi use ffmpeg 7.1.1 and looks like there is no AC4 decoder available since avcodec_find_decoder_by_name dont return the decoder

I don't know if 7.2 will have it, seem also exists unofficial patched ffmpeg with ac4 support, but i don't think it's worth it, better wait for the official ffmpeg implementation

How has this been tested?

https://ott.dolby.com/OnDelKits/AC-4/Dolby_AC-4_Online_Delivery_Kit_1.5/help_files/topics/kit_wrapper_HLS_multiplexed_streams.html

Screenshots (if appropriate):

Types of change

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] Clean up (non-breaking change which removes non-working, unmaintained functionality)
• [ ] Improvement (non-breaking change which improves existing functionality)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that will cause existing functionality to change)
• [ ] Cosmetic change (non-breaking change that doesn't touch code)
• [ ] None of the above (please explain below)

Checklist:

• [ ] I have read the Contributing document
• [ ] My code follows the Code Guidelines of this project
• [ ] My change requires a change to the Wiki documentation
• [ ] I have updated the documentation accordingly