feat: update audio merging service

[drewcook]

General Changes

• Adds in utilities for working with ffmpeg
  • Adds in utility for merging multiple audio blobs together to a singular one
  • Adds in utility to fetch a file and/or use it for transcoding, mainly just stubs this out but doesn't use it
• Applies new merge utility to minting/buying projects as nfts and cuts down time spent sending to python service
• Removes all references to python merge backend service, completely decoupling the UI from it

Developer Notes

Add any notes here that may be helpful for reviewers.

---

Author Checklist

• [ ] The base branch is set to main
• [ ] The title is using Conventional Commit formatting
• [ ] The Github issue has been linked to the PR in the Development section
• [ ] The General Changes section has been filled out
• [ ] Developer Notes have been added (optional)

Reviewer Checklist

• [ ] End-to-end tests are passing without any errors
• [ ] Code style generally follows existing patterns
• [ ] New third-party packages, if any, do not introduce potential security threats
• [ ] There are no CI changes, or they have been OK’d by the devops team
• [ ] Code changes have been quality checked in the ephemeral URL
• [ ] There is at least one approval from the core team
• [ ] Squash and merge has been checked

[vercel[bot]]

The latest updates on your projects. Learn more about Vercel for Git ↗︎

Name	Status	Preview	Updated
ui	✅ Ready (Inspect)	Visit Preview	Dec 15, 2022 at 7:57PM (UTC)

[vercel[bot]]

Deployment failed with the following error:

Invalid vercel.json file provided

[vercel[bot]]

Deployment failed with the following error:

Header at index 0 has invalid `source` pattern "/*".

Learn More: https://vercel.link/invalid-route-source-pattern