Integrate webRequest redirecting to preserve urls on ipfs/ens sites.

[danfinlay]

The way we incorporate redirecting should preserve the URL context (either ens:// or ipfs:// etc). This would also allow decentrally-hosted sites to persist cookies even after the gateway is changed.

I think that API may be webRequest.onBeforeRequest().

That work can build on #7362, and should also be useful for the snaps system.

[danfinlay]

When we're ready to resume supporting ipfs resolution, we should reach out to Colin from protocol labs (@protocolin on their slack). He offered to connect us with some relevant people.

[Gudahtt]

Closing as a duplicate of #9353, which despite being more recent seemed to be a bit less prescriptive about how we'd accomplish this? At least in the title anyway.