Support scoped proxy on mapper scan feature

[kazuki43zoo]

Fixes gh-476

By this change, the develop become can specified scope of mapper using mapper scan feature option and scope annotation(@Scope, @RefreshScope, etc ...).
The defaultScope apply to the mapper bean(MapperFactoryBean) when scope of scanned bean definition is singleton (default scope) and create a scoped proxy bean for scanned mapper when final scope is not singleton.

Usage option on mapper scan feature

The developer can specify the scope of mapper bean that not specified scope annotation using option of mapper scan feature.

Using @MapperScan

@Cpnfiguration
@MapperScan(defaultScope = "refresh")
class MyBatisConfig {
  // ...
}

Using MapperScannerConfigurer

@Bean
MapperScannerConfigurer mapperScannerConfigurer() {
  MapperScannerConfigurer configurer = new MapperScannerConfigurer();
  configurer.setDefaultScope("refresh");
  // ...
  return  configurer;
}

Using XML Namespace(<mybatis:scan/>)

<mybatis:scan base-package="org.mybatis.spring.mapper" default-scope="refresh" />

Using scope annotation

The developer can specify the scope per mapper using scope annotation.

// equiv to @Scope(scopeName = "refresh", proxyMode = ScopedProxyMode.TARGET_CLASS)
@RefreshScope
@Mapper 
public interface MyMapper {
  // ...
}