feat: support PostgreSQL COPY WITH options

[minleejae]

COPY already models table/query sources and STDIN/STDOUT, but rejects PostgreSQL's WITH (FORMAT csv, HEADER true) option syntax. Preserve the optional WITH keyword, including PostgreSQL's accepted WITH-only legacy form, and reject empty option entries in the new WITH form and PostgreSQL dialect.

Reuse CopyStatement's option representation and add a select-writer overload so query expressions reach the configured deparser. Tests cover CSV delimiters/nulls, column-list and wildcard FORCE_QUOTE, HEADER MATCH, ON_ERROR, CTE/UNION queries, AST edits, and malformed lists. Existing DuckDB tests pass. PROGRAM, WHERE, COPY data-body parsing, and DML RETURNING query sources are outside this change.

Syntax reference: PostgreSQL COPY.

Validation:

• Java 17 Gradle check: 7,829 XML-reported tests, 0 failures/errors, 25 skipped; formatting, grammar ambiguity, Checkstyle, PMD, and JMH compilation passed. Formatting was checked against upstream/master using a local Spotless ratchet override.
• Actual PostgreSQL 17.11 server: 13 accepted and 6 rejected SQL cases matched the expected behavior.
• Executed both AST and StatementDeParser output for the accepted cases on the same server: 26 successful executions. COPY FROM STDIN cases also loaded CSV/text rows and verified row counts.