feat: model MySQL CREATE TABLE AS duplicate handling

[minleejae]

Support MySQL CREATE TABLE ... IGNORE/REPLACE [AS] query with a typed duplicate-handling enum. Previously these modifiers were rejected or consumed as table-option tokens.

Centralize query-prefix detection so table and partition options stop before the modifier, and render it through the shared CREATE TABLE query path. Tests cover omitted AS, SELECT/TABLE/VALUES, CTEs, and parentheses.

Validation:

• Full Gradle check passed (Java 17), including grammar ambiguity, unit tests, coverage, formatting, Checkstyle, PMD, and SpotBugs.
• On MySQL 8.4.11, duplicate-key CTAS retained the first row with IGNORE and the last row with REPLACE; all three SQL renderings matched.
• Added AST, mutation, and parse/deparse regression coverage.

Syntax reference: official documentation.

Additional version-boundary validation: the original, toString, and deparser SQL was executed on isolated MySQL 9.7.2 and 26.7.0 servers, including the focused behavioral cases. Reviewed the MySQL 9.7 and MySQL 26.7 grammar. Runtime version numbers above identify the tested binaries; this does not claim support for every statement in those DBMS versions.

[manticore-projects]

Thank you!