refactor: async routing (#489)

* feat: async routing

* chore: put dht extra api commands under content routing

* chore: add default option to createPeerInfo

Co-Authored-By: Jacob Heun <jacobheun@gmail.com>

* chore: address review

* chore: rm dlv

test/peer-routing/utils.js

@@ -0,0 +1,24 @@
+'use strict'
+
+const KadDht = require('libp2p-kad-dht')
+const mergeOptions = require('merge-options')
+const baseOptions = require('../utils/base-options')
+
+module.exports.baseOptions = baseOptions
+
+const routingOptions = mergeOptions(baseOptions, {
+  modules: {
+    dht: KadDht
+  },
+  config: {
+    dht: {
+      kBucketSize: 20,
+      randomWalk: {
+        enabled: true
+      },
+      enabled: true
+    }
+  }
+})
+
+module.exports.routingOptions = routingOptions