优化单元测试，新增 BaseDbUnitTest 和 BaseDbAndRedisUnitTest 基类，解决 SpringBoot 自动配置，导致启动过慢

src/main/java/cn/iocoder/dashboard/framework/mybatis/config/MybatisConfiguration.java

@@ -13,7 +13,8 @@ import org.springframework.context.annotation.Configuration;
  * @author 芋道源码
  */
 @Configuration
-@MapperScan(value = "${yudao.info.base-package}", annotationClass = Mapper.class)
+@MapperScan(value = "${yudao.info.base-package}", annotationClass = Mapper.class,
+        lazyInitialization = "${mybatis.lazy-initialization:false}") // Mapper 懒加载，目前仅用于单元测试
 public class MybatisConfiguration {
 
     @Bean