libp2p http transport example

We should validate that we can utilize js-libp2p to fetch content from another libp2p node that supports an IPFS gateway over libp2p.

see https://github.com/ipfs/kubo/blob/master/docs/experimental-features.md#http-gateway-over-libp2p for more details.

1. set up a kubo node and enable the http-gateway-over-libp2p experiment: ipfs config --json Experimental.GatewayOverLibp2p true
2. load some known content into the kubo node's blockstore (because the experiment won't fetch remote content)
3. create and register libp2p handler for /http/1.1 (I don't think one exists yet? the development of this example can be used when creating http over libp2p for js-libp2p) via components.registrar.register
4. Ensure we can send an http request to that kubo node listening on the /http transport, and get a valid http response back.

Start with the Kubo experimental-features documentation for HTTP gateway over libp2p and the components.registrar.register entry point. Set up a Kubo node with the experiment enabled, load known content, and investigate the /http/1.1 handler described in the issue. Done means an HTTP request over the /http transport returns a valid response from the node.