Support structured MySQL table definitions

[minleejae]

Summary

• add ordered, typed AST models for table elements, table options, column options, references, and MySQL type modifiers
• share index, constraint, and reference parsing between CREATE TABLE and ALTER TABLE
• support the remaining valid MySQL table-definition forms while preserving legacy accessors and deparsing compatibility
• add minimized MySQL regression tests with AST usability and round-trip assertions

Validation

• ./gradlew test spotlessCheck checkstyleMain checkstyleTest
• 5,141 tests passed (25 skipped)
• MySQL 8.4.11 execution corpus: all 36 targeted CREATE TABLE failures now parse into typed CreateTable ASTs
• 516/516 typed statements deparse and reparse successfully