Move cli sub-project out of server to libs (#31184)

This commit moves the cli sub-project out of server to libs where it
makes more sense.

Author: jasontedor

build.gradle

@@ -205,7 +205,7 @@ subprojects {
     "org.elasticsearch.gradle:build-tools:${version}": ':build-tools',
     "org.elasticsearch:rest-api-spec:${version}": ':rest-api-spec',
     "org.elasticsearch:elasticsearch:${version}": ':server',
-    "org.elasticsearch:elasticsearch-cli:${version}": ':server:cli',
+    "org.elasticsearch:elasticsearch-cli:${version}": ':libs:cli',
     "org.elasticsearch:elasticsearch-core:${version}": ':libs:elasticsearch-core',
     "org.elasticsearch:elasticsearch-nio:${version}": ':libs:elasticsearch-nio',
     "org.elasticsearch:elasticsearch-x-content:${version}": ':libs:x-content',

server/cli/build.gradle renamed to libs/cli/build.gradle

@@ -19,17 +19,15 @@
 
 package org.elasticsearch.cli;
 
-import java.io.Closeable;
+import joptsimple.NonOptionArgumentSpec;
+import joptsimple.OptionSet;
+import org.elasticsearch.core.internal.io.IOUtils;
+
 import java.io.IOException;
 import java.util.Arrays;
 import java.util.LinkedHashMap;
 import java.util.Map;
 
-import joptsimple.NonOptionArgumentSpec;
-import joptsimple.OptionSet;
-
-import org.elasticsearch.core.internal.io.IOUtils;
-
 /**
  * A cli tool which is made up of multiple subcommands.
  */