Add support for T-Digest (#2214)

* wip

* close #2216 - add support for TDIGEST.MERGESTORE and make compression optional on TDIGEST.CREATE

* fix some tdigest commands, use bloom edge docker

* fix index.ts

* 2.4-RC2 (v2.4.1)

* fix some commands and tests

* clean code

packages/bloom/lib/commands/t-digest/BYRANK.spec.ts

@@ -0,0 +1,21 @@
+import { strict as assert } from 'assert';
+import testUtils, { GLOBAL } from '../../test-utils';
+import { transformArguments } from './BYRANK';
+
+describe('TDIGEST.BYRANK', () => {
+    it('transformArguments', () => {
+        assert.deepEqual(
+            transformArguments('key', [1, 2]),
+            ['TDIGEST.BYRANK', 'key', '1', '2']
+        );
+    });
+
+    testUtils.testWithClient('client.tDigest.byRank', async client => {
+        const [ , reply ] = await Promise.all([
+            client.tDigest.create('key'),
+            client.tDigest.byRank('key', [1])
+        ]);
+
+        assert.deepEqual(reply, [NaN]);
+    }, GLOBAL.SERVERS.OPEN);
+});