Motivation

The pipeline module, this shows details module structure expose to other module.

If refactor pipeline module's for internal structure change sql_processor module into broken.
https://github.com/SpringQL/SpringQL/blob/main/springql-core/src/sql_processor/sql_parser/pest_parser_impl.rs#L23-L46

Refactoring target

• use pub mod for architecture defined component.
• use private mod and use re-export for inter component API.