feat: mock plugins with real configs

so you no longer need to comment out xpack config in the kibana.dev.yml

plugins/apm/index.js

@@ -0,0 +1,18 @@
+export function apm(kibana) {
+  return new kibana.Plugin({
+    name: 'apm',
+    id: 'apm',
+    configPrefix: 'xpack.apm',
+    config(Joi) {
+      return Joi.object({
+        ui: Joi.object({
+          enabled: Joi.boolean().default(true),
+        }).default(),
+        enabled: Joi.boolean().default(true),
+        indexPattern: Joi.string().default('apm*'),
+        minimumBucketSize: Joi.number().default(15),
+        bucketTargetCount: Joi.number().default(27),
+      }).default();
+    },
+  });
+}