fix: Allow spaces/special chars in application names

closes #534

lib/routes/admin-api/metrics-schema.js

@@ -1,13 +1,12 @@
 'use strict';
 
 const joi = require('joi');
-const { nameType } = require('./util');
 
 const applicationSchema = joi
     .object()
     .options({ stripUnknown: false })
     .keys({
-        appName: nameType,
+        appName: joi.string().required(),
         sdkVersion: joi.string().optional(),
         strategies: joi
             .array()