[#3529294] Enforce uses sorting in CAS Server project.

phpcs.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<ruleset name="drupal-cas-server">
+  <description>PHP CodeSniffer configuration for CAS Server project.</description>
+  <rule ref="Drupal"/>
+  <rule ref="DrupalPractice"/>
+  <rule ref="SlevomatCodingStandard.Namespaces.AlphabeticallySortedUses">
+    <properties>
+      <property name="caseSensitive" value="true"/>
+    </properties>
+  </rule>
+  <arg name="extensions" value="php,inc,module,install,info,test,profile,theme"/>
+</ruleset>