fix: avoid recursion when deparsing statement lists

[minleejae]

Calling Statements.accept(new StatementDeParser(builder), context) currently throws StackOverflowError, even for an empty list: the deparser visits the same container again instead of its children. This prevents callers from rendering or rewriting a parsed SQL script through one visitor.

This change visits each child statement and shares list separators between Statements.toString() and StatementDeParser. Block and IfElseStatement gain callback-based rendering overloads, so nested lists use the same separator policy and IF conditions and branches reach custom visitors. The supplied context is forwarded at those dispatch points. Existing toString() output, branch/block semicolon flags, and error-recovery null placeholders are preserved.

Regression coverage includes empty and repeated calls, adjacent DDL/DML statements, nested blocks, IF/ELSE delimiter flags, custom condition and statement visitors, AST immutability, unsupported statements and error recovery. Dialect round trips cover MySQL, PostgreSQL quoted routine/DO bodies, Oracle blocks and SQL Server IF statements. The usage guide includes a complete-list deparser example.

Validation:

• ./gradlew spotlessApply check --no-daemon: 7,505 tests, 0 failures/errors, 25 skipped; includes 30 new regression cases.
• mvn --batch-mode --no-transfer-progress clean verify: 7,487 tests, 0 failures/errors, 25 skipped.

The change is confined to rendering and visitor dispatch; it does not change the grammar or interpret procedural bodies.

[manticore-projects]

Thank you!