Add amg_ext:audioChannelLayout

[harshith-d]

• Audio Channel Layout specifies the arrangement and spatial configuration of audio channels within an audio stream
• AN30-5495

[shashi-banger]

@harshith-d Channel layout vocabulary should be limited to following set

channel_layout: type: string description: Channel layout of the audio description. https://trac.ffmpeg.org/wiki/AudioChannelManipulation#Listchannelnamesandstandardchannellayouts enum:

• mono
• stereo
• 2.1
• 3
• quad
• 3.1
• 4.1
• 5.1
• 7.1