feat: Attach to corestore replication stream and emit core keys

This is a sketch of how syncing cores could work. I will pivot however
to syncing an autobase specifically so the entire corestore doesn't need
to be synced.

.eslintrc.json

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+{
+    "env": {
+        "browser": true,
+        "es2021": true,
+        "node": true
+    },
+    "extends": "standard",
+    "overrides": [
+    ],
+    "parserOptions": {
+        "ecmaVersion": "latest",
+        "sourceType": "module"
+    },
+    "rules": {
+    }
+}

.gitignore

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+# Edit at https://www.toptal.com/developers/gitignore?templates=node
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.nvmrc

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+v16.17.0

index.js

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+import Protomux from 'protomux'
+import c from 'compact-encoding'
+
+export default function emitNewCores (store, cb, ...args) {
+  const replicationStream = store.replicate(...args)
+
+  const mux = Protomux.from(replicationStream.noiseStream)
+
+  const channel = mux.createChannel({ protocol: 'full-send' })
+  channel.open()
+
+  const message = channel.addMessage({ encoding: c.string })
+  message.onmessage = cb
+
+  store.on('core-open', (core) => {
+    message.send(core.key.toString('hex'))
+  })
+
+  return replicationStream
+}