feat: add custom SMS screen

feat: custom messages database migration
feat: populate custom SMS screen with database data
feat: custom SMS creation modal
fix: small fixes on styling

lib/new-admin/graphql/resolvers/sms.resolver.js

@@ -0,0 +1,12 @@
+const customSms = require('../../../custom-sms')
+
+const resolvers = {
+  Query: {
+    customMessages: () => customSms.getCustomMessages()
+  },
+  Mutation: {
+    createCustomMessage: (...[, { event, deviceId, message }]) => customSms.createCustomMessage(event, deviceId, message)
+  }
+}
+
+module.exports = resolvers