Support CLUSTER commands (#2015)

* Support CLUSTER commands

* add some client tests

* remove only

* delete cluster slaves

* delete reset clietn test

* SET SLOT

* test with client

* fix fail

* Update CLUSTER_COUNTKEYSINSLOT.spec.ts

* move commands to client/commands.ts

* clusterNode

* remove CLUSTER-SET-CONFIG-EPOCH test with client

* clean code

Co-authored-by: leibale <leibale1998@gmail.com>

packages/client/lib/commands/CLUSTER_FAILOVER.spec.ts

@@ -0,0 +1,20 @@
+import { strict as assert } from 'assert';
+import { FailoverModes, transformArguments } from './CLUSTER_FAILOVER';
+
+describe('CLUSTER FAILOVER', () => {
+    describe('transformArguments', () => {
+        it('simple', () => {
+            assert.deepEqual(
+                transformArguments(),
+                ['CLUSTER', 'FAILOVER']
+            );
+        });
+        
+        it('with mode', () => {
+            assert.deepEqual(
+                transformArguments(FailoverModes.FORCE),
+                ['CLUSTER', 'FAILOVER', 'FORCE']
+            );
+        });
+    });
+});