Create a `Container` model

[tcely]

This depends on the asset types being added to choices.py first.

• Add asset types to choices #1420

This depends on the Codec table being populated first.

• Create a Codec model #1421
• Add codecs for the audio asset type #1459
• Add codecs for the video asset type #1460

Create a new model for a database table to hold rows for containers that are supported.

Container database table partial example:

Extension	Asset Type	Number Supported	Codec
m4a	audio	1	[Codec.pk of <audio,aac>]
m4a	audio	1	[Codec.pk of <audio,alac>]
webm	audio	8	[Codec.pk of <audio,opus>]
webm	video	1	[Codec.pk of <video,vp9>]
webm	video	1	[Codec.pk of <video,avc1>]
mkv	video	1	[Codec.pk of <video,avc1>]

[mady20]

Hi @tcely, can I take this one? I’d like to work on it.