Support RedisTimeSeries (#1757)

* Implement missing commands and add test

* Update DECRBY.spec.ts

* Small changes

* clean code

* Update MGET_WITHLABELS.ts

Use map in transformReply

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

packages/time-series/lib/commands/MADD.spec.ts

@@ -0,0 +1,39 @@
+import { strict as assert } from 'assert';
+import testUtils, { GLOBAL } from '../test-utils';
+import { transformArguments } from './MADD';
+
+describe('MADD', () => {
+    it('transformArguments', () => {
+        assert.deepEqual(
+            transformArguments([{
+                key: '1',
+                timestamp: 0,
+                value: 0
+            }, {
+                key: '2',
+                timestamp: 1,
+                value: 1
+            }]),
+            ['TS.MADD', '1', '0', '0', '2', '1', '1']
+        );
+    });
+
+    // Should we check empty array?
+
+    testUtils.testWithClient('client.ts.mAdd', async client => {
+        await client.ts.create('key');
+
+        assert.deepEqual(
+            await client.ts.mAdd([{
+                key: 'key',
+                timestamp: 0,
+                value: 0
+            }, {
+                key: 'key',
+                timestamp: 1,
+                value: 1
+            }]),
+            [0, 1]
+        );
+    }, GLOBAL.SERVERS.OPEN);
+});