Support IPIP-412

This is about supporting https://github.com/ipfs/specs/pull/412

```[tasklist]
### Tasks
- [ ] https://github.com/ipfs/boxo/pull/370
- [ ] https://github.com/ipfs/gateway-conformance/pull/87
```
