[PTDT-3037] Add AUDIO AttachmentType

[kvilon]

Description

Please include a summary of the changes and the related issue. Please also include relevant motivation and context.

Related PR:
https://github.com/Labelbox/intelligence/pull/24902

Fixes # (issue)

Type of change

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• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Document change (fix typo or modifying any markdown files, code comments or anything in the examples folder only)

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New Feature Submissions

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Changes to Core Features

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[kvilon]

Tests actually pass: