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/MGET.spec.ts

@@ -0,0 +1,29 @@
+import { strict as assert } from 'assert';
+import testUtils, { GLOBAL } from '../test-utils';
+import { transformArguments } from './MGET';
+
+describe('MGET', () => {
+    it('transformArguments', () => {
+        assert.deepEqual(
+            transformArguments('label=value'),
+            ['TS.MGET', 'FILTER', 'label=value']
+        );
+    });
+
+    testUtils.testWithClient('client.ts.mGet', async client => {
+        await client.ts.add('key', 0, 0, {
+            LABELS: { label: 'value' }
+        });
+
+        assert.deepEqual(
+            await client.ts.mGet('label=value'),
+            [{
+                key: 'key',
+                sample: {
+                    timestamp: 0,
+                    value: 0
+                }
+            }]
+        );
+    }, GLOBAL.SERVERS.OPEN);
+});