Replace prost with quick-protobuf

[dignifiedquire]

Currently rust-libp2p and iroh are working on getting rid of the need for protoc in its builds. The current plan is to switch to quick-protobuf.

For iroh it would be very useful if libipld switched too, as we otherwise need to avoid parts of libipld.

Refs:

• Migrate from protoc to quick-protobuf and remove the buildscripts libp2p/rust-libp2p#3024
• Migrate from protoc to quick-protobuf n0-computer/beetle#67

[vmx]

The current DAG-PB version is not spec compliant. The proper fix would be to do the same as the JS implementation and the Go implementation and just encode and decode manually, so no need for a protocol buffers library would be needed. Both implementations can serve as a template, depending on whether someone prefers JS or Go.

AFAICT libipld currently doesn't need protoc as we've checked in the generated file.

[dignifiedquire]

AFAICT libipld currently doesn't need protoc as we've checked in the generated file.

There is still a dependency on prost which I would like to drop.

[dignifiedquire]

The current DAG-PB version is not spec compliant. The proper fix would be to do the same as the JS implementation and the Go implementation and just encode and decode manually, so no need for a protocol buffers library would be needed. Both implementations can serve as a template, depending on whether someone prefers JS or Go.

That's a lot more work though.