Allow to specify custom MapperFactoryBean class on xml based bean definition

[kazuki43zoo]

I've supported to specify a custom MapperFactoryBean on <mybatis:scan>(MapperScannerBeanDefinitionParser) and MapperScannerConfigurer because support factoryBean attribute at @MapperScan.

@MapperScan (Already supported in 2.0.0 or before) :

@MapperScan(basePackages = "x.y.z.mapper", factoryBean = CustomMapperFactoryBean.class)
public class DataAccessConfiguration {
  // ...
}

XML namespace (Will support since 2.0.1):

<mybatis:scan base-package="x.y.z.mapper"
                mapper-factory-bean-class="x.y.z.mapper.CustomMapperFactoryBean"/>

MapperScannerConfigurer (Will support since 2.0.1):

<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
  <property name="basePackage" value="x.y.z.mapper" />
  <property name="mapperFactoryBeanClass" value="x.y.z.mapper.CustomMapperFactoryBean" />
  <!-- ... -->
</bean>