[Feature][Support Struct] Support ORC Struct subfield lazy load.

[Smith-Cruise]

What type of PR is this：

• [ ] BugFix
• [x] Feature
• [ ] Enhancement
• [ ] Refactor
• [ ] UT
• [ ] Doc
• [ ] Tool

In this pr:

1. I add a LoadType class, CompoundLoad is used for the struct subfield lazy load, which means this field's subfield will contain both lazy load field and no lazy load field.
2. I moved LazyLoad test cases out of the apache-orc folder, so that run-ut.sh can test orc lazy load directly.
3. I add a struct subfield lazy load test.

Checklist:

• [x] I have added test cases for my bug fix or my new feature
• [ ] I have added user document for my new feature or new function