`multicodec` v4.0.0: generate JavaScript exports from CSV

[darrylyeo]

Revives the previously deprecated multicodec npm package as discussed here.

• Include https://github.com/multiformats/multicodec as a Git submodule

• npm run generate:json – use csvtojson to generate a JSON file multicodecs.json from table.csv

• npm run generate:typescript – use quicktype to generate inferred TypeScript types from multicodecs.json

• Export multicodec data and TypeScript types from the multicodec package

  • Default export / multicodecs: JavaScript array of Multicodecs
  • multicodecsByName: JavaScript object indexed by name
  • multicodecsByCode: JavaScript object indexed by code (base 10)

• Add workflow to automatically update submodule, re-generate, and publish