Add support for lua scripts in client & muilti, fix client socket initiator, implement simple cluster nodes discovery strategy

lib/lua-script.ts

@@ -0,0 +1,24 @@
+import { createHash } from 'crypto';
+import { RedisCommand } from './commands';
+
+export interface RedisLuaScriptConfig extends RedisCommand {
+    SCRIPT: string;
+    NUMBER_OF_KEYS: number;
+}
+
+interface SHA {
+    SHA: string;
+}
+
+export type RedisLuaScript = RedisLuaScriptConfig & SHA;
+
+export interface RedisLuaScripts {
+    [key: string]: RedisLuaScript;
+}
+
+export function defineScript<S extends RedisLuaScriptConfig>(script: S): S & SHA {
+    return {
+        ...script,
+        SHA: createHash('sha1').update(script.SCRIPT).digest('hex')
+    };
+}