Register MIME type application/car with IANA

[olizilla]

It would be useful to have a registered mime type for CAR files for use in web applications that want to accept user provided CARs. nft.storage is already using application/car for CARs. I'd like to let users provide a specific mime type when they want to upload a CAR.

• https://github.com/ipfs-shipyard/nft.storage/blob/3a95b18bfeeec5821593ccecef6057b0c6174892/packages/api/src/utils/car.js#L21-L24
• https://github.com/nftstorage/ipfs-cluster/blob/2c4cb39c68a385b97347ba75e2b6d531c1b973c3/index.js#L39-L41

Note: Registrations in the standards tree must be approved by the IESG or must correspond to a formal publication by a recognized standards body.

🤔 next up, how to become a recognised standards body.

see: the other issue about registering mime types #102
see: the form to fill in https://www.iana.org/form/media-types

[olizilla]

https://datatracker.ietf.org/doc/html/rfc6838#section-3.1

3.1. Standards Tree
The standards tree is intended for types of general interest to the
Internet community. Registrations in the standards tree MUST be
either:

1. in the case of registrations associated with IETF specifications,
   approved directly by the IESG, or

2. registered by a recognized standards-related organization using
   the "Specification Required" IANA registration policy [RFC5226]
   (which implies Expert Review).
   ...
   In the second case, the IESG makes a one-time decision on whether the
   registration submitter represents a recognized standards-related
   organization; after that, a Media Types Reviewer (Designated Expert
   or a group of Designated Experts) performs the Expert Review as
   specified in this document. Subsequent submissions from the same
   source do not involve the IESG. The format MUST be described by a
   formal standards specification produced by the submitting standards-
   related organization.