Add support for redis functions (#2020)

* fix #1906 - implement BITFIELD_RO

* initial support for redis functions

* fix test utils

* redis functions commands and tests

* upgrade deps

* fix "Property 'uninstall' does not exist on type 'SinonFakeTimers'"

* upgrade dockers version

* Merge branch 'master' of github.com:redis/node-redis into functions

* fix FUNCTION LIST WITHCODE and FUNCTION STATS

* upgrade deps

* set minimum version for FCALL and FCALL_RO

* fix FUNCTION LOAD

* FUNCTION LOAD

* fix FUNCTION LOAD & FUNCTION LIST & FUNCTION LOAD WITHCODE

* fix FUNCTION_LIST_WITHCODE test

packages/client/lib/commands/FCALL_RO.spec.ts

@@ -0,0 +1,29 @@
+import { strict as assert } from 'assert';
+import testUtils, { GLOBAL } from '../test-utils';
+import { MATH_FUNCTION, loadMathFunction } from '../client/index.spec';
+import { transformArguments } from './FCALL_RO';
+
+describe('FCALL_RO', () => {
+    testUtils.isVersionGreaterThanHook([7, 0]);
+
+    it('transformArguments', () => {
+        assert.deepEqual(
+            transformArguments('function', {
+                keys: ['key'],
+                arguments: ['argument']
+            }),
+            ['FCALL_RO', 'function', '1', 'key', 'argument']
+        );
+    });
+
+    testUtils.testWithClient('client.fCallRo', async client => {
+        await loadMathFunction(client);
+
+        assert.equal(
+            await client.fCallRo(MATH_FUNCTION.library.square.NAME, {
+                arguments: ['2']
+            }),
+            4
+        );
+    }, GLOBAL.SERVERS.OPEN);
+});