feat: support delegated value store in content-routing module

[yusefnapora]

This adds support for delegated put / get operations in the content-routing module instead of always using the DHT. It depends on some in-progress PRs, so CI is currently failing.

Dependencies:

• [ ] https://github.com/libp2p/js-libp2p-interfaces/pull/108
• [ ] https://github.com/libp2p/js-libp2p-delegated-content-routing/pull/54

To run the tests locally, you can checkout the PR branch of js-libp2p-interfaces and npm link it into js-libp2p. For now, I'm depending on a commit hash for the delegated-content-routing PR, but that doesn't work for libp2p-interfaces since it's a multi-module repo.

This adds a new entry to the config modules object called valueStorage which can contain ValueStore implementations. Currently the only non-DHT implementation is in the delegated-content-routing PR above.

I don't think the config change is technically a breaking API change since it's additive - if you don't add the new valueStorage module in your config you just won't get delegated put/get operations, but the DHT will still work if you've enabled it.

[BigLep]

Moving this to draft until we're able to give a concerted effort on IPNS improvements as part of https://github.com/ipfs/js-ipfs/issues/2921