Implement the legacy_file_format pragma

easy implementation, sqlite claims it is a noop now

"This pragma no longer functions. It has become a no-op. The capabilities
formerly provided by PRAGMA legacy_file_format are now available using
the SQLITE_DBCONFIG_LEGACY_FILE_FORMAT option to the sqlite3_db_config()
C-language interface."

vendored/sqlite3-parser/src/parser/ast/mod.rs

@@ -1618,6 +1618,8 @@ pub enum PragmaName {
     CacheSize,
     /// `journal_mode` pragma
     JournalMode,
+    /// Noop as per SQLite docs
+    LegacyFileFormat,
     /// Return the total number of pages in the database file.
     PageCount,
     /// returns information about the columns of a table