[PAY-2328] Track page stems & downloads section

[dharit-tan]

Description

• Adds stems & downloads UI to the track page
• Make Expandable its own component.
• Remove the useSelector arg in useDownloadTrackButtons hook, seems unnecessary now.

Download logic is not complete, just added the UI scaffolding.

How Has This Been Tested?
Local web stage, also confirmed downloads still work on mobile.
In this screenshot the stems are missing filenames due to incorrect data during upload, but should work for new uploads.

[vercel]

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1 Ignored Deployment

Name	Status	Preview	Comments	Updated (UTC)
audius-web-ssr	⬜️ Ignored (Inspect)	Visit Preview		Jan 11, 2024 7:34pm

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[audius-infra]

Preview this change https://demo.audius.co/rt-ui