增加BaseService四个通用方法：
List<Record> selectByExampleWithBLOBsForStartPage(Example example,
Integer pageNum, Integer pageSize);
List<Record> selectByExampleForStartPage(Example example, Integer
pageNum, Integer pageSize);
List<Record> selectByExampleWithBLOBsForOffsetPage(Example example,
Integer offset, Integer limit);
List<Record> selectByExampleForOffsetPage(Example example, Integer
offset, Integer limit);

This reverts commit 3853ad1f.

This reverts commit 835f5e3344a5588cab1b3dc137e4cf4facb26d68.

This reverts commit 7510531e963a796bdf9ee98f7ee748837581217c.

This reverts commit 6966c0ec792337d821e06ec2b51e7916ef4f6640.