Add experimental DuckDB backend support

.github/workflows/duckdb-package-fast-fail-tests.txt

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+# Recent package-local DuckDB PHPUnit defects to run before broad DuckDB suites.
+WP_DuckDB_Driver_Parity_Tests::test_coalesce_date_text_numeric_comparisons_match_sqlite
+WP_DuckDB_Driver_Parity_Tests::test_post_text_numeric_identifier_predicates_match_sqlite
+WP_DuckDB_Driver_Parity_Tests::test_numeric_identifier_text_value_predicates_match_sqlite
+WP_DuckDB_Driver_Parity_Tests::test_invalid_literal_regexp_patterns_preserve_left_expression_errors
+WP_DuckDB_Driver_Parity_Tests::test_invalid_literal_regexp_patterns_match_sqlite
+WP_DuckDB_Driver_Parity_Tests::test_select_list_date_text_numeric_boundaries_match_sqlite
+WP_DuckDB_Driver_Parity_Tests::test_sum_aggregate_results_match_sqlite_and_remain_fetchable
+WP_DuckDB_Driver_Parity_Tests::test_constant_expression_text_value_scalar_comparisons_match_sqlite
+WP_DuckDB_Driver_Parity_Tests::test_constant_expression_in_list_items_match_sqlite
+WP_DuckDB_Driver_Parity_Tests::test_constant_expression_between_bounds_match_sqlite
+WP_DuckDB_Driver_Tests::test_text_value_numeric_literal_predicates_are_translated_without_duckdb_runtime
+WP_DuckDB_Driver_Parity_Tests::test_datediff_numeric_literal_comparisons_match_sqlite
+WP_DuckDB_Driver_Tests::test_datediff_numeric_literal_comparisons_are_translated_without_duckdb_runtime
+WP_DuckDB_Driver_Parity_Tests::test_date_add_sub_numeric_literal_comparisons_match_sqlite
+WP_DuckDB_Driver_Parity_Tests::test_date_add_sub_numeric_literal_comparisons_preserve_expression_errors
+WP_DuckDB_Driver_Parity_Tests::test_date_part_quoted_string_comparisons_match_sqlite
+WP_DuckDB_Driver_Parity_Tests::test_date_part_quoted_string_comparisons_match_sqlite_for_invalid_strings
+WP_DuckDB_Driver_Parity_Tests::test_date_part_quoted_string_comparisons_preserve_expression_errors
+WP_DuckDB_Driver_Parity_Tests::test_date_function_numeric_literal_comparisons_match_sqlite
+WP_DuckDB_Driver_Parity_Tests::test_date_format_numeric_literal_comparisons_match_sqlite
+WP_DuckDB_Driver_Parity_Tests::test_datediff_invalid_string_inputs_match_sqlite
+WP_DuckDB_Driver_Tests::test_multi_table_delete_removes_expired_transient_alias_rows_with_literal_timeout
+WP_DuckDB_Driver_Tests::test_wordpress_options_on_duplicate_key_update_insert_branch_uses_returning
+WP_DuckDB_Driver_Tests::test_wordpress_options_multi_name_fast_path_uses_one_native_query_on_fresh_driver
+WP_DuckDB_Driver_Tests::test_insert_id_tracks_on_duplicate_key_update_policy
+WP_DuckDB_Driver_Tests::test_stored_procedure_emulation_rejects_unsupported_bodies
+WP_DuckDB_Driver_Tests::test_no_argument_select_stored_procedure_is_emulated
+WP_DuckDB_Driver_Tests::test_select_mysql_functions_are_emulated
+WP_DuckDB_Runtime_Gate_Tests::test_native_duckdb_rejects_savepoints_without_corrupting_transaction
+WP_DuckDB_Driver_Parity_Tests::test_regexp_and_not_regexp_match_sqlite
+WP_DuckDB_Driver_Parity_Tests::test_select_archive_year_month_group_order_by_post_date_matches_sqlite
+WP_DuckDB_Driver_Parity_Tests::test_select_archive_week_group_date_format_order_by_post_date_matches_sqlite
+WP_DuckDB_Driver_Parity_Tests::test_posts_slug_status_date_order_ties_match_sqlite_index_order
+WP_DuckDB_Driver_Parity_Tests::test_select_cast_convert_binary_expressions_match_sqlite
+WP_DuckDB_Driver_Parity_Tests::test_select_date_time_literal_functions_match_sqlite
+WP_DuckDB_Driver_Parity_Tests::test_woocommerce_lookup_table_schema_metadata_matches_sqlite
+WP_DuckDB_Driver_Parity_Tests::test_woocommerce_lookup_queries_match_sqlite
+WP_DuckDB_Driver_Tests::test_regexp_predicates_are_emulated
+WP_DuckDB_Driver_Parity_Tests::test_alter_table_drop_primary_key_temporary_shadow_matches_sqlite
+WP_DuckDB_Driver_Tests::test_wordpress_term_relationships_post_count_fast_path_uses_one_native_query
+WP_DuckDB_Driver_Tests::test_wordpress_shared_term_split_group_by_fast_path_uses_bounded_native_query
+WP_DuckDB_Driver_Tests::test_information_schema_statistics_exact_projection_fast_path_skips_stage_table
+WP_DuckDB_Driver_Tests::test_select_comments_group_by_primary_key_orders_by_joined_meta_value
+WP_DuckDB_Driver_Tests::test_select_comments_group_by_primary_key_orders_by_cast_joined_meta_value
+WP_DuckDB_Driver_Tests::test_select_comments_group_by_primary_key_orders_by_multiple_cast_joined_meta_values