deduplicate content-type-parser.ts

[lidel]

We seem to have the same code related to content type parsersing in multiple places:

• https://github.com/search?q=org%3Aipfs+application%2Fvnd.ms-powerpoint&type=code (!)
  • https://github.com/ipfs/service-worker-gateway/blob/957a9506c6c89b069d27ca4f6986e9ee1c6ef4a3/src/lib/content-type-parser.ts
  • https://github.com/ipfs/helia-http-gateway/blob/8c568ffb940846ef73e1d8b31f793e9d42d3c319/src/content-type-parser.ts
  • https://github.com/ipfs/helia-verified-fetch/blob/c36970d615bb07113b8971c3ec88e36f9b30f1f6/packages/gateway-conformance/src/fixtures/content-type-parser.ts

There should be a single source of truth, having unique copy used only in conformance tests reduces trust in having meaningful content-type tests anywhere

[SgtPooki]

action items:

1. determine bundle size once adding into verified-fetch by default before proceeding.. we don't want to increase size dramatically
2. switch back to original file-type library since Consider alternate (browser friendly) buffer sindresorhus/file-type#578 is closed now

[SgtPooki]

size increase of verified-fetch is < 25kb