Support new muilti pop commands (#2051)

* Support new muilti pop commands

* remove .only

* clean code

* fix for 4558ec6a31

* fix tests

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

packages/client/lib/commands/BLMPOP.ts

@@ -0,0 +1,20 @@
+import { RedisCommandArgument, RedisCommandArguments } from '.';
+import { transformLMPopArguments, LMPopOptions, ListSide } from './generic-transformers';
+
+export const FIRST_KEY_INDEX = 3;
+
+export function transformArguments(
+    timeout: number,
+    keys: RedisCommandArgument | Array<RedisCommandArgument>,
+    side: ListSide,
+    options?: LMPopOptions
+): RedisCommandArguments {
+    return transformLMPopArguments(
+        ['BLMPOP', timeout.toString()],
+        keys,
+        side,
+        options
+    );
+}
+
+export { transformReply } from './LMPOP';