Add CLIENT LIST command and fix CLIENT INFO (#2368)

* fix client info

* add client list

* fix key validation in transformClientInfoReply

* fix issue with field in CLIENT LIST reply

* clean code

* fix multimem

* fix qbufFree argvMem totMem multiMem

Co-authored-by: Leibale <me@leibale.com>

packages/client/lib/commands/CLIENT_LIST.ts

@@ -0,0 +1,43 @@
+import { RedisCommandArguments, RedisCommandArgument } from '.';
+import { pushVerdictArguments } from './generic-transformers';
+import { transformReply as transformClientInfoReply, ClientInfoReply } from './CLIENT_INFO';
+
+interface ListFilterType {
+    TYPE: 'NORMAL' | 'MASTER' | 'REPLICA' | 'PUBSUB';
+    ID?: never;
+}
+
+interface ListFilterId {
+    ID: Array<RedisCommandArgument>;
+    TYPE?: never;
+}
+
+export type ListFilter = ListFilterType | ListFilterId;
+
+export const IS_READ_ONLY = true;
+
+export function transformArguments(filter?: ListFilter): RedisCommandArguments {
+    let args: RedisCommandArguments = ['CLIENT', 'LIST'];
+
+    if (filter) {
+        if (filter.TYPE !== undefined) {
+            args.push('TYPE', filter.TYPE);
+        } else  {
+            args.push('ID');
+            args = pushVerdictArguments(args, filter.ID);
+        }
+    }
+
+    return args;
+}
+
+export function transformReply(rawReply: string): Array<ClientInfoReply> {
+    const split = rawReply.split('\n'),
+        length = split.length - 1,
+        reply: Array<ClientInfoReply> = [];
+    for (let i = 0; i < length; i++) {
+        reply.push(transformClientInfoReply(split[i]));
+    }
+    
+    return reply;
+}