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/FUNCTION_LIST_WITHCODE.spec.ts

@@ -0,0 +1,42 @@
+import { strict as assert } from 'assert';
+import testUtils, { GLOBAL } from '../test-utils';
+import { MATH_FUNCTION, loadMathFunction } from '../client/index.spec';
+import { transformArguments } from './FUNCTION_LIST_WITHCODE';
+
+describe('FUNCTION LIST WITHCODE', () => {
+    testUtils.isVersionGreaterThanHook([7, 0]);
+
+    describe('transformArguments', () => {
+        it('simple', () => {
+            assert.deepEqual(
+                transformArguments(),
+                ['FUNCTION', 'LIST', 'WITHCODE']
+            );
+        });
+
+        it('with pattern', () => {
+            assert.deepEqual(
+                transformArguments('patter*'),
+                ['FUNCTION', 'LIST', 'patter*', 'WITHCODE']
+            );
+        });
+    });
+
+    testUtils.testWithClient('client.functionListWithCode', async client => {
+        await loadMathFunction(client);
+
+        assert.deepEqual(
+            await client.functionListWithCode(),
+            [{
+                libraryName: MATH_FUNCTION.name,
+                engine: MATH_FUNCTION.engine,
+                functions: [{
+                    name: MATH_FUNCTION.library.square.NAME,
+                    description: null,
+                    flags: ['no-writes']
+                }],
+                libraryCode: MATH_FUNCTION.code
+            }]
+        );
+    }, GLOBAL.SERVERS.OPEN);
+});