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.ts

@@ -0,0 +1,16 @@
+export enum FailoverModes {
+    FORCE = 'FORCE',
+    TAKEOVER = 'TAKEOVER'
+}
+
+export function transformArguments(mode?: FailoverModes): Array<string> {
+    const args = ['CLUSTER', 'FAILOVER'];
+
+    if (mode) {
+        args.push(mode);
+    }
+
+    return args;
+}
+
+export declare function transformReply(): 'OK';