[Feature] Add AudioStore entity as a child of MediaStore

[obulat]

Problem Description

To ingest audio data, the catalog needs to have the AudioStore class that would validate the data and save it to the disk.

Solution Description

After extracting the common functionality for storing any media type into MediaStore class, we can add other types of media by creating a child class that implements add_item with cleaning and validation that is specific to audio type. This means that we will need to list columns for all the metadata that we will store for audios.

Alternatives

We could add a separate AudioStore class that is not a child of MediaStore, but then we would lose the ability to reuse the common code, and would probably have a lot of code duplication.

Additional context

This is a part of the meta issue on adding audio