Implement Realm joining (#193)

* Pass client options to ping

* Implement RealmAPI to auth

* Add Realm join example

* Update package.json

* Update README.md

* Update index.d.ts

* Show one option, remove listener

* Fix wording

* Explain options

* Optional fields

* Fix typo

* Moved retry ad host/port extraction to prealms

* Add docs

* Fix lint

* Depend on prealms release

Co-authored-by: LucienHH <Lucien.holloway@aprox.co.uk>

examples/client/realm.js

@@ -0,0 +1,13 @@
+/* eslint-disable */
+const bedrock = require('bedrock-protocol')
+const client = bedrock.createClient({
+  realms: {
+    // realmId: '1234567', // Connect the client to a Realm using the Realms ID
+    // realmInvite: 'https://realms.gg/AB1CD2EFA3B', // Connect the client to a Realm using the Realms invite URL or code
+    pickRealm: (realms) => realms.find(e => e.name === 'Realm Name') // Connect the client to a Realm using a function that returns a Realm
+  }
+})
+
+client.on('text', (packet) => { // Listen for chat messages
+    console.log('Received Text:', packet)
+})