goctl model reactor (#15)

* reactor sql generation

* reactor sql generation

* add console & example

* optimize unit test & add document

* modify default config

* remove test file

* Revert "remove test file"

This reverts commit 81041f9e

* fix stringx.go & optimize example

* remove unused code

tools/goctl/model/sql/example/sql/user.sql

@@ -0,0 +1,15 @@
+-- 用户表 --
+CREATE TABLE `user` (
+  `id` bigint(10) NOT NULL AUTO_INCREMENT,
+  `name` varchar(255) COLLATE utf8mb4_general_ci NOT NULL DEFAULT '' COMMENT '用户名称',
+  `password` varchar(255) COLLATE utf8mb4_general_ci NOT NULL DEFAULT '' COMMENT '用户密码',
+  `mobile` varchar(255) COLLATE utf8mb4_general_ci NOT NULL DEFAULT '' COMMENT '手机号',
+  `gender` char(5) COLLATE utf8mb4_general_ci NOT NULL COMMENT '男｜女｜未公开',
+  `nickname` varchar(255) COLLATE utf8mb4_general_ci DEFAULT '' COMMENT '用户昵称',
+  `create_time` timestamp NULL DEFAULT CURRENT_TIMESTAMP,
+  `update_time` timestamp NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
+  PRIMARY KEY (`id`),
+  UNIQUE KEY `name_index` (`name`),
+  KEY `mobile_index` (`mobile`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci;
+