feat: add createLibp2p to generate a PeerInfo instance

[jacobheun]

createLibp2p is a new exported helper function that allows users to create a libp2p instance without worrying about creating a PeerInfo instance first.

Now instead of needing to do this:

const PeerInfo = require('peer-info')
const Libp2p = require('libp2p')
PeerInfo.create((err, peerInfo) => {
  const libp2p = new Libp2p({
    ...options,
    peerInfo
  }) 
  // Use libp2p
})

you can just do:

const { createLibp2p } = require('libp2p')
createLibp2p(options, (err, libp2p) => {
    // Use libp2p
}) 

While the code change is not significant, it removes the need to know about PeerInfo creation prior to creating a libp2p instance. This should hopefully help reduce the barrier to entry by a small degree.

I also changed Node to Libp2p because the naming is unnecessarily confusing and nondescript.

[vasco-santos]

👍

[dirkmc]

Nice 👍

Was there a docs change too?

[jacobheun]

Was there a docs change too?

No but good call, I am updated deps so I will include a docs update with that.