feature idea: PubSub tab

While playing around a bit with ipfs, I have created a version of ipfs-webui that has a simple PubSub tab based on the [browser-pubsub example](https://github.com/ipfs/js-ipfs-http-client/tree/master/examples/browser-pubsub) from js-ipfs-http-client.

As described in the example, it requires a daemon started via `ipfs daemon --enable-pubsub-experiment` (but also works in brave via integrated jsipfs). Since I'm an absolute JS newbe, the code is very hacky (and unsubscribe does not work at the moment). The webui fork containing the code can be found here: https://github.com/ArneBinder/ipfs-webui

ipfs-webui w/ pubsub:
https://ipfs.io/ipfs/QmQEEMUAfDT1w8nH2FQFSU6dkopQb8Hm2TSwswa3evqXxR/#/pubsub

What do you think about something like that? Does it make sense to have a PubSub playground in webui?